Ever wonder why some people thrive on keto while others struggle with endless fatigue? The secret might lie deep within your cells—in the microscopic power plants called mitochondria. When you slash carbs and embrace fat as fuel, you’re not just changing your macro ratios; you’re fundamentally rewiring how your cells produce energy. This metabolic shift demands more from your mitochondria than ever before, and that’s where targeted supplementation becomes a game-changer.
Two compounds—PQQ (pyrroloquinoline quinone) and CoQ10 (coenzyme Q10)—have emerged as the dynamic duo for mitochondrial support, especially for those following a ketogenic lifestyle. While CoQ10 acts like the spark plug in your cellular engine, PQQ works as the master builder, constructing new mitochondria to meet your energy demands. Together, they don’t just support your existing energy production—they supercharge it, helping you transition into ketosis with fewer side effects and greater vitality.
Understanding Mitochondria: Your Cellular Powerhouses
What Are Mitochondria and Why Do They Matter?
Mitochondria are double-membraned organelles floating in nearly every cell of your body, converting nutrients into adenosine triphosphate (ATP)—the universal currency of cellular energy. Think of them as billions of tiny batteries constantly recharging to power everything from muscle contractions to neurotransmitter synthesis. Each cell contains hundreds to thousands of these structures, with high-energy tissues like your heart, brain, and muscles housing the densest populations.
The efficiency of your mitochondria directly correlates with how energetic, mentally sharp, and metabolically flexible you feel. When mitochondrial function declines, you experience the classic symptoms keto dieters dread: brain fog, physical exhaustion, and that dreaded “keto flu” that can derail even the most committed enthusiast. Supporting these organelles isn’t just about feeling better today—it’s about optimizing your body’s ability to thrive on fat for decades to come.
The Keto Diet’s Unique Impact on Mitochondrial Function
Switching from glucose to ketones as your primary fuel source represents one of the most profound metabolic shifts your body can undergo. This transition forces mitochondria to upregulate fat-burning enzymes, enhance oxidative capacity, and literally build new organelles through a process called mitochondrial biogenesis. Research shows that ketogenic diets can actually improve mitochondrial efficiency over time, but the adaptation period places extraordinary stress on your existing cellular infrastructure.
During this phase, your mitochondria must work overtime to produce ATP from unfamiliar fuel sources while simultaneously rebuilding their internal machinery. This dual demand—maintaining current energy output while engineering a more robust system—creates a temporary deficit that can leave you feeling drained. Strategic supplementation with mitochondrial support compounds provides the raw materials and catalytic signals needed to accelerate this transformation.
The Cellular Energy Crisis on Keto
Why Energy Dips Happen During Keto Adaptation
That infamous keto flu isn’t just about electrolyte imbalances—it’s a mitochondrial energy crisis. When you suddenly restrict carbohydrates, your cells lose their quick-access glucose fuel while your fat-burning machinery is still being constructed. Your existing mitochondria, optimized for glucose metabolism, struggle to meet energy demands using fatty acids and ketones they’re not yet efficient at processing.
This mismatch between energy demand and mitochondrial capacity creates a temporary ATP shortage. Your cells send distress signals that manifest as fatigue, headaches, and mental sluggishness. Compounding the problem, the early stages of ketosis increase oxidative stress as mitochondria adapt to burning fat, generating more reactive oxygen species (ROS) until antioxidant defenses catch up. This oxidative burden can damage mitochondrial membranes and further impair ATP production.
The Role of Mitochondrial Biogenesis in Fat Adaptation
Mitochondrial biogenesis—the creation of new mitochondria—isn’t just beneficial for keto adaptation; it’s essential. Your cells must increase mitochondrial density to handle the higher oxygen consumption and longer metabolic pathways required for fat oxidation. This process is orchestrated by PGC-1α (peroxisome proliferator-activated receptor gamma coactivator 1-alpha), the master regulator of mitochondrial replication.
The challenge? This biogenesis process itself requires substantial energy and specific signaling molecules. Without adequate support, your body struggles to produce new mitochondria fast enough to keep pace with the metabolic demands of ketosis. This is where targeted supplementation becomes crucial, providing both the building blocks and the molecular signals that accelerate mitochondrial multiplication, shortening the adaptation window from weeks to days.
CoQ10: The Electron Transport Chain Champion
What Is Coenzyme Q10 and How Does It Work?
Coenzyme Q10 is a fat-soluble, vitamin-like compound that resides in the inner mitochondrial membrane, where it serves as the critical electron shuttle in the electron transport chain (ETC). Picture it as a ferry boat, continuously picking up electrons from Complex I and II and delivering them to Complex III, enabling the proton gradient that ultimately drives ATP synthesis. Without adequate CoQ10, this process becomes bottlenecked, and energy production grinds to a halt.
Your body synthesizes CoQ10 endogenously, but production peaks in your twenties and gradually declines with age. Statin medications, certain genetic variants, and oxidative stress can further deplete levels. For keto dieters, the demand for CoQ10 intensifies because fat oxidation requires more electron transport activity than glucose metabolism. Supplementing ensures your ETC operates at full capacity during the critical adaptation phase and beyond.
CoQ10’s Critical Role in ATP Production
Every molecule of ATP your mitochondria generate depends on CoQ10’s electron-shuttling capacity. When you consume dietary fat on keto, fatty acids undergo beta-oxidation in the mitochondrial matrix, feeding electrons into the ETC at multiple points. This creates a higher throughput demand on CoQ10 compared to the more streamlined glucose pathway. Without sufficient CoQ10, electrons leak from the chain, forming damaging free radicals instead of productive energy.
Supplementation studies consistently show that CoQ10 enhances ATP production in tissues with high metabolic demands. For keto dieters, this translates to more stable energy levels, improved exercise capacity, and reduced oxidative damage during the adaptation period. The compound also functions as a powerful lipid-soluble antioxidant, protecting mitochondrial membranes from the increased ROS generated during fat metabolism.
The Ubiquinol vs Ubiquinone Distinction
When selecting a CoQ10 supplement, you’ll encounter two forms: ubiquinone (the oxidized form) and ubiquinol (the reduced, active form). While your body can convert between these states, the conversion efficiency decreases with age and under oxidative stress—conditions common during keto adaptation. Ubiquinol represents the electron-ready form that directly participates in ATP production and antioxidant protection.
For keto dieters, ubiquinol offers superior absorption and immediate bioavailability, particularly important when your mitochondria are under increased demand. The reduced form also provides more potent antioxidant protection, neutralizing the lipid peroxides that can damage mitochondrial membranes during the high-fat metabolic state. While ubiquinone supplements are more affordable and still effective, ubiquinol’s enhanced absorption makes it the preferred choice for those serious about mitochondrial optimization.
PQQ: The Mitochondrial Biogenesis Igniter
Understanding Pyrroloquinoline Quinone
PQQ is a redox cofactor and potent antioxidant that operates through mechanisms distinct from CoQ10. While CoQ10 optimizes existing mitochondrial function, PQQ activates the signaling pathways that create new mitochondria entirely. This compound stimulates PGC-1α and Nrf2 pathways, essentially telling your cells to ramp up mitochondrial production and enhance cellular antioxidant defenses simultaneously.
Found in trace amounts in fermented foods and certain vegetables, PQQ isn’t considered a vitamin but functions as a crucial growth factor for mitochondria. Its unique molecular structure allows it to withstand thousands of redox cycles, making it exceptionally efficient at neutralizing free radicals. For keto dieters, PQQ’s dual action—sparking new mitochondrial growth while protecting existing ones—addresses both the quantity and quality aspects of cellular energy production.
How PQQ Stimulates New Mitochondria Growth
The magic of PQQ lies in its ability to activate mitochondrial biogenesis at the genetic level. By upregulating PGC-1α, PQQ triggers a cascade that increases expression of nuclear-encoded mitochondrial proteins, leading to the synthesis of new mitochondrial components and ultimately, entire new organelles. Studies show PQQ supplementation can increase mitochondrial density by 20-30% in animal models, with human research demonstrating similar trends.
This mitochondrial multiplication is precisely what keto dieters need during adaptation. More mitochondria mean greater capacity to process fatty acids and ketones, reducing the energy bottleneck that causes keto flu symptoms. The process typically takes 2-3 weeks to manifest noticeable effects, which aligns perfectly with the keto adaptation timeline. Combining PQQ with CoQ10 creates a powerful synergy: PQQ builds more factories while CoQ10 ensures each factory operates at peak efficiency.
PQQ’s Additional Neuroprotective Benefits
Your brain is an energy hog, consuming 20% of your body’s ATP despite comprising only 2% of its mass. During keto adaptation, when energy is scarce, cognitive symptoms often hit hardest. PQQ offers unique neuroprotective properties that make it invaluable for maintaining mental clarity. It stimulates nerve growth factor (NGF) production, supports neurotransmitter synthesis, and protects neurons from excitotoxicity.
The compound crosses the blood-brain barrier readily, delivering its mitochondrial and antioxidant benefits directly to brain cells. Research demonstrates PQQ can improve memory, attention, and processing speed—benefits that keto dieters frequently report anecdotally. For those concerned about the cognitive transition to ketosis, PQQ provides a buffer, ensuring your neurons maintain robust energy production while your metabolism rewires itself.
The Synergistic Power of PQQ and CoQ10 Combined
Why These Two Compounds Work Better Together
CoQ10 and PQQ aren’t just complementary—they’re synergistic. CoQ10 optimizes the function of existing mitochondria, while PQQ creates new ones. This combination addresses both immediate energy needs and long-term capacity building. Think of it as tuning up your current engine while simultaneously installing additional engines to handle increased demand.
The synergy extends beyond simple addition. PQQ’s antioxidant protection preserves CoQ10 from oxidation, maintaining its active state longer. Meanwhile, the increased ATP production from CoQ10-enhanced mitochondria provides the energy required for PQQ-stimulated biogenesis. This positive feedback loop accelerates adaptation and creates a more resilient energy system. Clinical observations suggest the combination produces effects greater than the sum of their individual contributions.
Clinical Evidence Supporting the Combination
Human studies combining PQQ and CoQ10 show remarkable improvements in energy, cognition, and oxidative stress markers. One double-blind trial demonstrated that participants taking both supplements experienced significantly greater reductions in fatigue and improvements in sleep quality compared to either compound alone. The combination group showed enhanced mitochondrial function markers and decreased inflammatory cytokines—precisely what struggling keto dieters need.
Another study focusing on cognitive function found that the PQQ-CoQ10 combination improved attention and working memory more effectively than CoQ10 alone, particularly in individuals with baseline fatigue. For keto dieters, this research validates what many discover through experimentation: addressing both mitochondrial quantity (PQQ) and quality (CoQ10) simultaneously yields superior results during the metabolic transition.
Mitochondrial Support on Ketogenic Diets: A Perfect Match
How Keto Enhances Mitochondrial Efficiency
Paradoxically, the ketogenic diet itself is one of the most powerful mitochondrial interventions available. Ketone bodies, particularly beta-hydroxybutyrate, act as signaling molecules that upregulate mitochondrial gene expression and enhance oxidative efficiency. They also reduce oxidative damage by increasing antioxidant enzyme production and decreasing ROS generation per unit of ATP produced.
This means keto creates the perfect environment for PQQ and CoQ10 to work their magic. The diet primes your cells for mitochondrial biogenesis, while the supplements provide the necessary cofactors and signals. It’s a case of 1+1=3: the metabolic state of ketosis combined with targeted supplementation creates a mitochondrial optimization protocol far more powerful than either approach in isolation. Your cells become not just fat-adapted, but energetically superior.
Why Supplementing Becomes Critical During Ketosis
While keto eventually enhances mitochondrial function, the adaptation phase creates a temporary deficit that can derail adherence. Supplementing with PQQ and CoQ10 bridges this gap, providing immediate support while your body builds its native capacity. Without this support, many people experience weeks of suboptimal function, leading them to abandon the diet before experiencing its benefits.
Additionally, the high-fat nature of keto increases your need for lipid-soluble antioxidants like CoQ10. Fatty acid oxidation generates more lipid peroxides than glucose metabolism, requiring robust antioxidant defenses to protect mitochondrial membranes. PQQ’s water- and lipid-soluble antioxidant properties provide complementary protection, creating a comprehensive shield against oxidative stress that could otherwise impair mitochondrial function long-term.
Key Benefits of Mitochondrial Support for Keto Dieters
Enhanced Energy and Reduced Keto Flu Symptoms
The most immediate benefit you’ll notice is a dramatic reduction in keto flu severity and duration. By ensuring robust ATP production from day one, CoQ10 minimizes the energy deficit that causes fatigue and malaise. PQQ’s biogenesis effects begin within days, gradually increasing your cellular energy capacity so that by week two or three, you’re running on a more powerful system than you started with.
Users consistently report feeling “cleaner” energy—less jittery than caffeine, more sustained than sugar. This isn’t a stimulant effect but genuine cellular energy optimization. The afternoon crashes that plague many keto dieters during adaptation often disappear entirely, replaced by stable, reliable energy that reflects true metabolic efficiency rather than mere survival.
Improved Mental Clarity and Cognitive Function
Brain fog represents one of the most frustrating keto adaptation symptoms, but it’s also where PQQ and CoQ10 shine brightest. The brain’s astronomical energy demands make it exquisitely sensitive to mitochondrial function. CoQ10 ensures existing brain mitochondria produce ATP efficiently, while PQQ stimulates new neuronal mitochondria and supports neurotransmitter balance.
The result is faster access to the mental clarity keto promises, often within the first week. Many users report improved focus, better memory retention, and enhanced problem-solving abilities that exceed their pre-keto baseline. This cognitive lift isn’t just about avoiding deficits—it’s about achieving performance levels that weren’t possible with glucose-dependent brain metabolism.
Better Exercise Performance and Recovery
Athletic performance often temporarily declines during keto adaptation as muscles adapt to burning fat. Mitochondrial support supplements can significantly mitigate this performance dip. CoQ10 enhances the ATP production capacity of muscle mitochondria, while PQQ increases mitochondrial density in muscle tissue, improving endurance and power output.
Post-exercise recovery also improves dramatically. The antioxidant properties of both compounds reduce exercise-induced oxidative damage, while enhanced ATP production speeds tissue repair. Many keto athletes find they can return to high-intensity training much sooner when supplementing with this combination, maintaining fitness levels that would otherwise deteriorate during the adaptation phase.
Longevity and Anti-Aging Implications
Beyond immediate keto benefits, optimizing mitochondrial function with PQQ and CoQ10 addresses one of the primary drivers of aging. The mitochondrial free radical theory of aging posits that accumulated mitochondrial damage over time leads to cellular decline. By enhancing biogenesis and providing robust antioxidant protection, these supplements help maintain mitochondrial integrity for the long haul.
Ketogenic diets themselves are associated with increased longevity in animal studies, likely through mitochondrial mechanisms. Adding targeted support amplifies these effects, potentially translating to slower cellular aging, better metabolic health, and reduced risk of age-related diseases. For those viewing keto as a long-term lifestyle, this represents a strategic investment in healthspan, not just a short-term energy fix.
Choosing Quality Mitochondrial Support Supplements
What to Look for in CoQ10 Supplements
When evaluating CoQ10 options, prioritize bioavailability above all else. Standard crystalline CoQ10 powder absorbs poorly, with some studies showing less than 5% uptake. Look for formulations using advanced delivery systems like VESIsorb, MicroActive, or other enhanced absorption technologies that create stable, water-soluble micelles. These can increase bioavailability by 300-600%, meaning you need lower doses for superior effects.
For the form itself, ubiquinol generally offers advantages for those over 30 or anyone experiencing significant oxidative stress. Check for third-party testing for purity and potency, as CoQ10 is prone to oxidation during manufacturing. The supplement should be packaged in opaque, airtight containers to prevent degradation. Doses typically range from 100-200mg daily, though during keto adaptation, some individuals benefit from 300mg split into two doses.
What to Look for in PQQ Supplements
PQQ supplements vary widely in quality and bioavailability. Look for products using the pure disodium salt form, which demonstrates superior stability and absorption. The standard effective dose ranges from 10-20mg daily, with 20mg showing optimal effects in human studies. Be wary of products containing unnecessary fillers or proprietary blends that obscure the actual PQQ content.
Since PQQ is a relatively new supplement, fewer brands offer advanced delivery systems, but some incorporate black pepper extract (piperine) or other absorption enhancers. Third-party verification is crucial, as PQQ is expensive to produce and some products contain less active compound than claimed. Consider supplements that combine PQQ with CoQ10 in a single formula, ensuring proper ratio and synergistic co-administration.
Dosage Considerations for Keto Dieters
During the initial 2-4 week keto adaptation phase, consider a loading approach: 200-300mg of CoQ10 (preferably ubiquinol) and 20mg of PQQ daily. This provides maximal support when your cells need it most. After adaptation, you can reduce to maintenance doses of 100mg CoQ10 and 10-20mg PQQ.
Timing matters for absorption. Take both supplements with your fattiest meal of the day, as their lipid-soluble nature requires dietary fat for optimal uptake. Morning administration works best for most people, aligning with natural circadian rhythms of mitochondrial activity. Some find splitting CoQ10 into two doses—morning and afternoon—provides more sustained energy throughout the day.
Timing and Absorption Optimization
The synergistic relationship between PQQ and CoQ10 means taking them together enhances their collective efficacy. Both supplements absorb better with dietary fat, making them perfect companions for your morning bulletproof coffee or avocado-rich breakfast. Avoid taking them with fiber supplements or high-fiber meals, which can interfere with absorption.
Consider cycling strategies for long-term use. Some evidence suggests taking PQQ continuously provides cumulative benefits, while others prefer 3-month cycles with a 2-week break. CoQ10 can be taken year-round without cycling. For maximum effect during keto adaptation, maintain consistent daily dosing for at least 30 days to allow PQQ-stimulated biogenesis to reach full expression.
Potential Side Effects and Interactions
Common Concerns with CoQ10 Supplementation
CoQ10 boasts an excellent safety profile, with decades of research confirming its tolerability. The most common side effect is mild gastrointestinal upset, typically resolved by taking the supplement with food. Some users report insomnia if taken late in the day due to its energizing effects—another reason for morning dosing.
Rarely, CoQ10 can lower blood pressure, which may require monitoring if you’re on antihypertensive medications. It can also reduce the effectiveness of blood-thinning medications like warfarin, though this interaction is uncommon. For keto dieters already experiencing blood pressure improvements, this effect is generally beneficial but warrants awareness.
PQQ Safety Profile and Considerations
PQQ demonstrates remarkable safety in human studies, even at doses far exceeding the standard 20mg recommendation. Some users report mild headaches or fatigue during the first few days—these typically represent positive mitochondrial changes rather than adverse reactions. The compound’s potent antioxidant activity can sometimes create temporary detoxification symptoms as cellular cleanup processes accelerate.
PQQ may enhance insulin sensitivity, which generally benefits keto dieters but could require adjustment if you’re on diabetes medications. As with any supplement affecting mitochondrial function, start with a lower dose and gradually increase to assess tolerance. The compound’s effects on neurotransmitter systems are overwhelmingly positive, but those with sensitive neurologic conditions should consult healthcare providers before starting.
Lifestyle Factors That Enhance Mitochondrial Health
Dietary Strategies Beyond Supplementation
While PQQ and CoQ10 provide powerful support, certain dietary choices can amplify their effects. Prioritize foods rich in mitochondrial cofactors: magnesium (found in leafy greens and nuts), B vitamins (especially B1, B2, and B3 from meats and eggs), and omega-3 fatty acids (from fatty fish). These nutrients serve as essential building blocks for mitochondrial membranes and enzyme systems.
Time-restricted eating and intermittent fasting further stimulate mitochondrial biogenesis through overlapping pathways with PQQ. The combination of ketosis, fasting, and targeted supplementation creates a powerful synergy, essentially putting your mitochondria through a high-performance training program. Avoid excess omega-6 fatty acids from processed seed oils, as these can incorporate into mitochondrial membranes and reduce their efficiency.
Exercise and Mitochondrial Biogenesis
Strategic exercise provides the most potent stimulus for mitochondrial growth—second only to PQQ supplementation. High-intensity interval training (HIIT) and resistance training both activate PGC-1α, complementing PQQ’s effects. During keto adaptation, moderate-intensity cardio can help train your mitochondria to burn fat more efficiently, while avoiding the glycolytic demands your body can no longer easily meet.
The timing of exercise relative to supplement intake matters. Taking PQQ and CoQ10 about an hour before training can enhance performance and recovery. Post-workout, these compounds help quench exercise-induced oxidative stress while supporting the mitochondrial biogenesis that drives fitness adaptations. This creates a virtuous cycle: exercise stimulates demand, supplements supply the means, and your mitochondria respond by becoming more numerous and efficient.
Sleep and Stress Management
Mitochondrial repair and biogenesis occur predominantly during deep sleep, making quality rest non-negotiable for keto adaptation. Poor sleep elevates cortisol, which impairs mitochondrial function and increases oxidative stress. Prioritize 7-9 hours of quality sleep, maintaining consistent sleep-wake times to support circadian mitochondrial rhythms.
Chronic stress depletes mitochondrial resources through constant cortisol elevation and increased energy demands. Stress management techniques like meditation, breathwork, and nature exposure have been shown to improve mitochondrial function and reduce oxidative damage. Combining these practices with PQQ and CoQ10 supplementation creates a comprehensive mitochondrial support protocol that addresses both the biochemical and lifestyle factors influencing cellular energy.
Frequently Asked Questions
How long does it take to feel the effects of PQQ and CoQ10 on keto?
Most people notice improved energy within 3-5 days of starting CoQ10, as it begins optimizing existing mitochondrial function immediately. PQQ’s effects on mitochondrial biogenesis typically become noticeable after 2-3 weeks of consistent use. The combination often shortens keto adaptation from 4-6 weeks to 2-3 weeks, with users reporting significant energy improvements by week two.
Can I take PQQ and CoQ10 if I’m not on a ketogenic diet?
Absolutely. These compounds benefit anyone seeking enhanced mitochondrial function, regardless of diet. However, their effects may be more pronounced on keto due to the increased mitochondrial demands. Non-keto users often report improved energy, cognitive function, and exercise recovery, though the magnitude of benefit might be slightly less dramatic than during fat adaptation.
Are there any foods that naturally contain high levels of PQQ and CoQ10?
CoQ10 is found in organ meats (especially heart and liver), fatty fish, and beef. PQQ exists in trace amounts in fermented foods like natto, green tea, and certain vegetables. However, obtaining therapeutic doses from food alone is impractical—you’d need to consume unrealistic quantities. Supplementation ensures you reach the levels shown effective in clinical studies.
Will these supplements kick me out of ketosis?
No, PQQ and CoQ10 contain zero calories and no macronutrients that could affect ketosis. They work at the cellular level to enhance energy production without impacting blood glucose, insulin, or ketone levels. In fact, by improving mitochondrial efficiency, they may help your body utilize ketones more effectively, potentially deepening ketosis.
Can I take too much PQQ or CoQ10?
Both compounds have excellent safety profiles with no known toxicity at reasonable doses. However, more isn’t always better. Doses above 300mg of CoQ10 or 40mg of PQQ show diminishing returns and may cause unnecessary expense. Stick to the evidence-based ranges: 100-200mg CoQ10 and 10-20mg PQQ for most people.
Should I cycle these supplements or take them continuously?
CoQ10 can be taken continuously without losing effectiveness. PQQ may offer cumulative benefits with long-term use, though some practitioners suggest 3-month cycles with brief breaks. During keto adaptation, continuous use for at least 30 days is recommended. After full adaptation, you can experiment with cycling to find what works best for your body.
Do PQQ and CoQ10 interact with exogenous ketones?
These supplements complement exogenous ketones beautifully. While ketones provide the fuel, PQQ and CoQ10 ensure your mitochondria can efficiently burn that fuel. Taking them together can smooth the transition into ketosis and reduce the amount of exogenous ketones needed to maintain energy levels. They address different aspects of the energy equation and have no negative interactions.
Will these supplements help with weight loss on keto?
While not direct fat burners, optimized mitochondrial function indirectly supports weight loss. Better energy means more physical activity and better exercise performance. Enhanced metabolic efficiency can improve insulin sensitivity and hormonal balance. However, the primary benefit is improved quality of life during weight loss, not accelerated fat loss itself.
Are there any genetic factors that affect how I respond to these supplements?
Certain genetic variants can influence your response. SNPs in the COQ2 gene affect endogenous CoQ10 production, making supplementation more crucial for some people. Variants in PGC-1α genes may influence how strongly you respond to PQQ’s biogenesis signals. While genetic testing can provide insights, most people benefit regardless of genotype, especially during the metabolic stress of keto adaptation.
Can children or pregnant women take PQQ and CoQ10 on keto?
While both compounds show excellent safety profiles, specific research in pregnancy and childhood is limited. Pregnant or nursing women should consult healthcare providers before starting any supplement regimen. Children on therapeutic ketogenic diets (for epilepsy, etc.) should only use these supplements under medical supervision. For otherwise healthy adults, these supplements are considered very safe.