Energy & Metabolism Supplements
A reasonable approach to supporting energy, nutrition, and metabolic health.
There is no supplement that reliably “boosts” energy or speeds up metabolism in an otherwise healthy, well-nourished person. The biggest gains usually come from getting the fundamentals right: adequate nutrition, good sleep, regular movement, and managing stress.
Supplements become much more useful when they address a real nutritional gap or support a specific metabolic goal.
Start With the Reason for Low Energy
Feeling tired does not automatically mean you need an “energy” supplement.
Low vitamin B12, iron, vitamin D, or magnesium can contribute to fatigue, and correcting a true deficiency can make a meaningful difference. But when those nutrients are already adequate, taking more usually does not create more energy.
That is why the reasonable approach is to look for the gap first, then supplement intentionally.
Persistent or unexplained fatigue also deserves a closer look. Thyroid problems, anemia, poor sleep, medication effects, mood disorders, and other treatable conditions can all show up as low energy.
Nutrients That Matter Most When You’re Low
These are not stimulants. They support normal processes your body already relies on to produce energy and function well.
Vitamin B12
Best when: Your intake or absorption may be low.
Vitamin B12 is essential for healthy red blood cells and normal nerve function. Low B12 can cause fatigue, weakness, and neurological symptoms.
B12 deserves extra attention if you are over 50, eat little or no animal-based food, or use medications such as metformin or long-term acid-reducing medicines that can reduce absorption.
If deficiency is suspected, a blood test can help determine whether supplementation is actually needed.
Iron
Best when: Iron stores are low.
Iron deficiency is a common and very treatable cause of fatigue, particularly in people who menstruate heavily or have other reasons for blood loss.
When iron is genuinely low, supplementation can make a major difference. When iron levels are already normal, taking additional iron does not provide extra energy and too much can be harmful.
This is one supplement where testing first makes sense.
Vitamin D
Best when: Vitamin D levels or sun exposure are low.
Vitamin D supports bone, muscle, immune, and overall health. Lower levels are more common in people who get little sun exposure, older adults, people with darker skin, and people carrying additional body weight.
For many adults, 800–1,000 IU per day is a commonly used supplemental amount, although individual needs can vary considerably.
Testing can help determine whether a larger dose is actually necessary.
Magnesium
Best when: Dietary magnesium intake is low.
Magnesium participates in hundreds of reactions throughout the body, including normal energy production, muscle function, and sleep.
Low intake is more likely when a diet contains relatively few whole foods and a large amount of highly processed food.
Magnesium is not an instant “energy booster,” but maintaining adequate magnesium gives the body what it needs to produce and use energy normally.
Want to compare the different forms?
Explore our Magnesium Guide for a closer look at magnesium glycinate, L-threonate, citrate, malate, taurate, and more.
Multivitamin + Mineral
Best when: Your diet leaves predictable nutritional gaps.
A quality multivitamin can be a reasonable nutritional insurance policy when food intake is limited.
It may be particularly useful if you:
- Eat very little overall
- Regularly skip entire food groups
- Follow a strict vegetarian or vegan diet
- Are over 50
- Have a condition that reduces nutrient absorption
Some research suggests a multivitamin may modestly reduce feelings of tiredness or affect energy expenditure, but if you already eat a varied, nutrient-rich diet, the additional benefit is likely small.
Think of a multivitamin as gap coverage—not a substitute for food.
Metabolic Support: Helpful, but Keep Expectations Reasonable
Some supplements are promoted as “metabolism boosters” or “fat burners.” A few have legitimate human research behind them, but the effects are usually modest.
They work best as additions to good nutrition and regular activity—not replacements for them.
Green Tea Extract + Caffeine
Best when: You want a modest adjunct for energy expenditure or body-composition goals.
Green tea compounds such as EGCG, particularly when combined with caffeine, are among the better-studied ingredients marketed for fat metabolism.
The effect is real but generally small.
Caffeine can also improve alertness, but more is not necessarily better. Higher intake may increase heart rate or blood pressure, cause jitteriness, and interfere with sleep—which can quickly work against your energy goals.
Berberine
Best when: Metabolic and blood-sugar support is the primary goal.
Berberine has evidence for improving blood glucose and several metabolic markers. It makes more sense as a targeted metabolic-support supplement than as a general energy booster.
Berberine can interact with medications and can meaningfully affect blood sugar. It should also be avoided during pregnancy.
For people using prescription medications—particularly medications affecting glucose—berberine deserves a more individualized approach.
Popular Options With Lower-Confidence Evidence
These supplements are commonly marketed for energy or metabolism. That does not necessarily mean they are useless—but expectations should match the evidence.
Coenzyme Q10 — CoQ10
CoQ10 plays an important role in cellular energy production, which makes the marketing story sound compelling.
For a generally healthy, well-nourished person, however, research has not consistently shown that taking additional CoQ10 noticeably improves fatigue.
There may be specific situations where CoQ10 makes more sense, but it is not a universal energy supplement.
Chromium
Chromium is frequently included in supplements marketed for glucose control, metabolism, and weight loss.
Evidence for meaningful weight-loss benefits is limited, and rare kidney or liver problems have been reported with chromium supplements.
It is generally a lower-priority option compared with addressing nutrition, activity, sleep, and better-supported metabolic strategies.
L-Carnitine
L-carnitine helps transport fatty acids into mitochondria, which is why it is often marketed for both “fat burning” and energy.
The biology makes sense. The results from supplementation are much less impressive.
Research has not shown a reliable energy or fat-loss benefit for the average well-nourished person, and side effects can occur.
It may have specialized uses, but it should not be viewed as a general metabolism booster.
Food, Sleep & Movement Still Do the Heavy Lifting
Supplements can fill gaps. They cannot compensate for the basics.
For better day-to-day energy and metabolic health, prioritize:
Eat enough protein and nutrient-dense food. Very low-calorie diets can leave you tired and make it difficult to meet vitamin and mineral needs.
Build and maintain muscle. Regular resistance training supports metabolic health and helps preserve lean body mass.
Move regularly. Consistent activity matters more than searching for a supplement that temporarily increases calorie burning.
Protect your sleep. Poor sleep can affect energy, appetite, blood sugar, and how active you feel the next day.
Look for the reason behind persistent fatigue. If you are constantly exhausted despite adequate sleep and nutrition, it is worth investigating rather than simply adding another supplement.
A Few Safety Reminders
More is not always better. Very high doses of nutrients—including vitamin E, beta-carotene, folic acid, and selenium—can cause harm.
Supplements can also interact with medications, and some products may not be appropriate during pregnancy or breastfeeding.
The goal is not to take as many supplements as possible.
The goal is to use the right supplement, for the right reason, when it actually adds value.
PHARMACIST-SELECTED OPTIONS
Ready to put this into practice?
Browse the supplements I selected for this collection based on evidence, quality, practicality, and overall value.
Health & Reason may earn revenue from purchases made through its Fullscript dispensary. That relationship does not determine what is recommended.
Educational information is not a substitute for individualized medical advice. Discuss persistent, severe, or unexplained symptoms with a healthcare professional.
Reviewed and edited by Kyle Smith, PharmD, MBA
Related topic: Magnesium.