The Best Supplements for Energy, Ranked by What the Evidence Supports
The energy aisle runs on one clever trick. B vitamins really are cofactors in the reactions that turn food into usable energy, so a label can say a nutrient helps convert food into energy and be technically accurate while implying something completely false — that taking more of it will make a normally-fed person feel less tired. It will not. On vitamin B12, the most heavily marketed energy nutrient of them all, the NIH Office of Dietary Supplements is blunt: supplementation appears to have no beneficial effect on performance in the absence of a nutritional deficit. That single sentence explains most of this category. The B12 shot, the B12 in your energy drink, the chewable that promises to help convert food into energy: all of them borrow credibility from a real biochemical role to sell a benefit that only materializes if you were low to begin with. So the honest framing is that energy supplements split into three groups, and knowing which group you are shopping in is the entire game. Group one is the stimulants, which genuinely produce an acute effect in anyone. Caffeine is the only member worth your money, and the best-evidenced way to take it is not an exotic blend — it is caffeine paired with L-theanine, two cheap ingredients tested together repeatedly in controlled trials on attention tasks, available with both doses printed on the label for the price of a couple of coffees. Group two is deficiency correction, which produces dramatic results in the specific people who are actually short and nothing at all in everyone else. Iron is the big one here, because genuine iron deficiency is a real and common cause of persistent fatigue — but iron is also the one supplement on this page that can hurt you if you take it without needing it, since your body has no route to excrete a surplus, the Tolerable Upper Intake Level for adults is 45 mg a day, and every bottle carries an FDA-mandated warning that accidental overdose of iron-containing products is a leading cause of fatal poisoning in children under six. Iron belongs in this list only with a blood test behind it. B12 sits in the same group, mattering narrowly and importantly for strict vegans and vegetarians, adults past about 50, people on metformin or long-term acid reducers, and anyone with pernicious anemia. Group three is everything else — the adaptogens, the CoQ10, the proprietary energy complexes — where the evidence for an energy effect in a healthy, non-deficient adult ranges from weak to absent, however good the ingredient may be for other reasons. The ranking below follows exactly that logic, which is why a six-cent caffeine capsule outranks a premium CoQ10 softgel. And the most useful advice on this page is not a product at all: persistent, unexplained fatigue is a medical symptom, not a shopping category. Low iron, thyroid disease, sleep apnea, depression, and poorly controlled blood sugar all present as tiredness, and all of them are found with a conversation and a blood panel rather than a tub. This is general information, not medical advice.
Top pick
Nutricost — Nutricost Caffeine with L-Theanine (100 mg each, 240 Capsules)
100 mg caffeine + 100 mg L-theanine per capsule, both doses printed with no proprietary blend, 240 capsules, GMP-manufactured and non-GMO, roughly six cents per capsule
Thorne — Iron Bisglycinate 25 mg (60 servings)
At a glance
Tap a row to check price · tap a header to sort| # | Best for | Price | ||
|---|---|---|---|---|
| 1 | | Best overall | 9.1/10 | $13.95 |
| 2 | | Biggest real-world fatigue fix | 8.6/10 | $16.00 |
| 3 |  | Best B12 | 8.2/10 | $17.48$23.89 |
| 4 |  | Best for training energy | 8/10 | $27.99 |
| 5 |  | Best pre-workout if you want the extras | 7.4/10 | $44.99 |
| 6 |  | The indirect route | 6.9/10 | $14.95 |
| 7 |  | The one the aisle oversells most for energy | 6.2/10 | $19.99$36.99 |
Prices pulled from Amazon as of Sep 10, 2026 and are subject to change. The price shown on Amazon at checkout applies.
How we scored
Every product below is scored on six metrics, 0-10 each, with the weighting described on how we review. The criteria specific to this category:
- Evidence for an energy effect specifically. This is the heaviest-weighted metric, and it is deliberately narrow. The question is not whether an ingredient is involved in energy metabolism — nearly every B vitamin is — but whether taking it produces a noticeable change in energy or performance in a person who is not deficient. Caffeine clears that bar in anyone. Iron and B12 clear it only in people who are genuinely short. Most of the rest of the aisle does not clear it at all, and we score accordingly rather than rewarding a plausible mechanism.
- Honesty about who it actually helps. A supplement aimed squarely at the people who benefit scores up; the same ingredient sold to the general public as an energy booster scores down. A single-nutrient B12 marketed to vegans and adults over 50 is a fair product. The identical B12 fronted with a lightning bolt and the word ENERGY is selling a result NIH says it cannot deliver to a non-deficient buyer, and that costs it points here.
- Dose and form that match the studies. We check that a serving delivers a research-relevant amount in the form the trials used — a printed caffeine and L-theanine dose rather than a blend, a sane 18-30 mg of elemental iron rather than a 65 mg tablet the gut cannot absorb in one go, a B12 dose that reflects how oral absorption actually works. Undersized doses buried inside a complex are marked down.
- Label honesty and no proprietary blends. The energy category is where proprietary blends do the most damage, because a combined milligram total lets a brand front-load cheap caffeine and sprinkle in trace amounts of everything advertised on the front of the tub. Fully disclosed labels score well. If a product will not tell you how much of each ingredient you are getting, it is telling you something.
- Third-party testing. Supplements are not pre-approved by the FDA, and stimulant products in particular have a long history of undeclared ingredients. We favor NSF Certified for Sport, Informed Sport, and USP verification, which matters most for anyone who competes in a tested sport, and we treat a seller's own clinical strength badge as marketing rather than evidence.
- Value at the dose that works. We price the serving that actually does something, not the cheapest serving on the label. This metric is where the category gets embarrassing for the premium end: the best-evidenced product here costs a few cents a capsule, while some of the worst performers on energy evidence cost twenty times as much.
What to know before buying
- If you are tired all the time, get a blood test before you buy anything. This is the single most valuable line on this page. Persistent, unexplained fatigue is a symptom with a real differential — iron deficiency, thyroid disease, sleep apnea, depression, blood sugar problems, medication side effects — and every one of those is identified with a clinician and a panel, not a supplement. A blood test also converts the two highest-value products here from guesses into targeted fixes, because iron and B12 work dramatically in people who are short and do nothing in people who are not. Guessing wastes money at best, and with iron it carries real risk.
- Caffeine is the only thing here that reliably works in a non-deficient person, and L-theanine makes it better. Caffeine plus L-theanine is the best-evidenced combination in the whole cognitive-supplement category, with repeated controlled trials on attention tasks, and it is also one of the cheapest things on the shelf. The theanine takes the edge off the jitter and the crash without blunting the alertness. Buy a product that prints both doses. If you already drink coffee, you are most of the way there — adding a plain L-theanine capsule to your usual cup is a perfectly reasonable version of this.
- Do not take iron without a blood test. Iron deficiency is a genuine and common cause of fatigue, and correcting it can be transformative, which is exactly why iron is worth taking seriously. But your body has no mechanism to excrete excess iron, the adult Tolerable Upper Intake Level is 45 mg a day, and iron-containing products carry an FDA-mandated warning because accidental overdose is a leading cause of fatal poisoning in children under six. Keep it locked away from kids. Get tested, supplement at a modest 18-30 mg elemental dose if you are actually low, and retest — do not take it on a hunch because you feel run down.
- B12 for energy is the biggest myth in the aisle. NIH states plainly that supplementation appears to have no beneficial effect on performance in the absence of a nutritional deficit. B12 is genuinely important, but for a narrow group: strict vegans and vegetarians, since B12 is essentially only found in animal foods; adults past about 50, because absorption declines; people on metformin or long-term acid reducers; and anyone with pernicious anemia, which is a medical condition rather than a shelf decision. If you are in one of those groups, buy a cheap, tested B12 and ignore the form premium. If you are not, this will do nothing for your energy.
- Skip the proprietary energy complexes, and treat stimulants as a tool with a cost. A tub listing twelve ingredients under one combined milligram figure is usually cheap caffeine plus fairy dust, and you are paying a large markup over plain caffeine. It is also worth being honest that stimulants borrow energy rather than create it: caffeine late in the day degrades the sleep that actually restores you, which is how people end up in a loop of tired mornings and bigger doses. Keep caffeine to earlier in the day, and treat sleep and food as the foundation this page sits on top of — see our recovery coverage for the other half of that argument.
Our picks
Nutricost — Nutricost Caffeine with L-Theanine (100 mg each, 240 Capsules)
Key specs: 100 mg caffeine + 100 mg L-theanine per capsule, both doses printed with no proprietary blend, 240 capsules, GMP-manufactured and non-GMO, roughly six cents per capsule
Pros
- Caffeine with L-theanine is the best-evidenced combination in the entire cognitive-supplement category, with repeated controlled trials on attention tasks
- Both doses are printed on the label — no proprietary blend hiding how much of either you are actually getting
- The theanine reliably takes the edge off caffeine jitter without blunting the alertness, which is the whole point of the pairing
- At around six cents a capsule it is the cheapest product on this page and the highest-scoring, which is the honest shape of this category
Cons
- It is a stimulant: it borrows energy rather than creating it, and taken late it will degrade the sleep that actually restores you
- 100 mg caffeine per capsule is a moderate dose — heavy coffee drinkers may find it mild, and stimulant-sensitive people may want the 2:1 theanine ratio instead
- Tolerance builds with daily use, so this works best as a tool for specific demands rather than an everyday crutch
Nutricost — Nutricost Caffeine with L-Theanine (100 mg each, 240 Capsules)
- Energy evidence10/10
- Dose & form9/10
- Label honesty10/10
- Third-party testing7/10
- Value10/10
Thorne — Iron Bisglycinate 25 mg (60 servings)
Key specs: Iron bisglycinate, 25 mg elemental iron per capsule, 60 servings, NSF Certified for Sport, gluten-free
Pros
- Genuine iron deficiency is one of the few common, correctable causes of persistent fatigue, and fixing it can be transformative rather than subtle
- 25 mg elemental sits in the sensible 18-30 mg range — above the RDA with headroom, well under the 45 mg upper limit
- Bisglycinate is generally gentler on the gut than ferrous sulfate, which matters because the main reason people quit iron is GI upset
- NSF Certified for Sport, so the identity and potency are independently verified and it is usable by tested athletes
Cons
- Do NOT take this without a blood test — your body cannot excrete surplus iron, and supplementing when you are not deficient carries real risk rather than no benefit
- Iron-containing products carry an FDA-mandated warning: accidental overdose is a leading cause of fatal poisoning in children under six, so this must be stored out of reach
- Even at a gentle dose, constipation and stomach upset are common enough that some people need to take it every other day
Thorne — Iron Bisglycinate 25 mg (60 servings)
- Energy evidence9/10
- Dose & form9/10
- Label honesty9/10
- Third-party testing10/10
- Value7/10
Nature Made — Vitamin B12 1000 mcg Softgels (150 count)
Key specs: 1000 mcg cyanocobalamin per softgel, 150 softgels (about a 5-month supply), USP Verified, gluten-free
Pros
- USP Verified, which is real independent confirmation of identity and potency rather than a self-printed badge
- Cyanocobalamin is the cheapest, most stable, most-studied form, and NIH found no evidence absorption varies by form — so paying up for methylcobalamin buys nothing
- Genuinely valuable if you are vegan or vegetarian, over about 50, on metformin or a long-term acid reducer, or have pernicious anemia
- About a five-month supply at an honest price, with a single-ingredient label rather than an energy complex
Cons
- For energy in a non-deficient person this does nothing — NIH states supplementation appears to have no beneficial effect on performance in the absence of a nutritional deficit
- If you eat animal foods and absorb normally, the 2.4 mcg adult RDA is almost certainly already covered by your diet
- The megadose on the label is dosed around roughly 1% passive absorption, not around a need you should push higher
Nature Made — Vitamin B12 1000 mcg Softgels (150 count)
- Energy evidence6/10
- Dose & form8/10
- Label honesty9/10
- Third-party testing10/10
- Value9/10
Optimum Nutrition — Creatine Monohydrate Powder (Micronized)
Key specs: 5g creatine monohydrate per serving, 600g tub, Creapure-grade micronized, single ingredient, no loading phase required
Pros
- The ISSN position stand calls creatine monohydrate the most effective ergogenic nutritional supplement available to athletes for high-intensity exercise capacity
- The energy it provides is real but specific: more quality reps and better work capacity in short, hard efforts, which compounds over months
- Single-ingredient label, 5 g disclosed per serving, and among the cheapest supplements per effective dose you can buy
- There is also a growing cognitive literature, with the most interesting signals under sleep deprivation and stress
Cons
- This will not make you feel more awake — if you are looking for an acute lift, this is the wrong product and caffeine is the right one
- Water-weight gain in the first weeks is normal and puts some people off
- Not third-party certified for sport at this price point; tested athletes should take the NSF option in our creatine roundup
Optimum Nutrition — Creatine Monohydrate Powder (Micronized)
- Energy evidence7/10
- Dose & form10/10
- Label honesty10/10
- Third-party testing7/10
- Value10/10
Legion — Pulse Pre-Workout (Fruit Punch)
Key specs: Naturally sweetened, creatine-free, fully disclosed doses of beta-alanine, citrulline and alpha-GPC, no proprietary blends
Pros
- Every dose is disclosed, which is rare in a category built on proprietary blends and makes the product possible to evaluate at all
- Naturally sweetened, with no artificial dyes, for people who would rather avoid them
- The supporting ingredients are real and sensibly dosed rather than sprinkled — citrulline and beta-alanine both have genuine performance literature
- A convenient single scoop if you want caffeine plus the training extras in one drink
Cons
- Most of the felt effect is the caffeine, which you can buy for a few cents a capsule — you are paying a large premium for the supporting cast
- Beta-alanine tingling is harmless but unpleasant enough that some people quit over it
- A pre-workout is a poor fit for general daytime tiredness; it is a training tool, not an all-day energy product
Legion — Pulse Pre-Workout (Fruit Punch)
- Energy evidence8/10
- Dose & form8/10
- Label honesty10/10
- Third-party testing6/10
- Value5/10
Nutricost — Ashwagandha KSM-66
Key specs: 600mg KSM-66 per capsule, standardized to 5% withanolides, 120-count
Pros
- Uses KSM-66, the standardized extract most of the human trials were actually run on, rather than a vague root powder
- The plausible route to more energy here is real but indirect — if it lowers stress and improves sleep quality, daytime energy follows
- Standardization percentage is printed, which is more than much of the botanical aisle manages
- Cheap per serving for a branded, standardized extract
Cons
- No direct energy effect — nobody takes ashwagandha and feels more awake an hour later, and it is not a caffeine substitute
- The trial literature is smaller and shorter than the marketing implies, and a lot of it is funded by ingredient suppliers
- There are real cautions: it is not for pregnancy, it can interact with thyroid and sedative medications, and rare liver-injury reports exist — worth a doctor conversation
Nutricost — Ashwagandha KSM-66
- Energy evidence5/10
- Dose & form8/10
- Label honesty8/10
- Third-party testing6/10
- Value8/10
Doctor's Best — High Absorption CoQ10 100 mg with BioPerine (120 softgels)
Key specs: 100 mg naturally fermented CoQ10 (ubiquinone) per softgel with BioPerine black pepper extract, 120 softgels, non-GMO, gluten-free
Pros
- A well-made product: a real 100 mg dose of fermented ubiquinone, the form used in the strongest outcome trials, at a fair price
- Ubiquinone rather than the marked-up ubiquinol, which is the right call — the body interconverts the forms
- BioPerine is a sensible absorption aid for a notoriously poorly-absorbed compound
- There are legitimate reasons to take CoQ10 — they are just not the reason it is sold in the energy aisle
Cons
- CoQ10's role in mitochondrial energy production is a mechanism story, not evidence that it makes a healthy adult feel more energetic
- The strongest human evidence is in heart failure and migraine, not in general fatigue — and this is the most expensive product on the page per month
- Ranked last here purely on energy evidence; see our dedicated CoQ10 roundup for the cases where it does earn its place
Doctor's Best — High Absorption CoQ10 100 mg with BioPerine (120 softgels)
- Energy evidence3/10
- Dose & form9/10
- Label honesty8/10
- Third-party testing6/10
- Value5/10
Frequently asked questions
Caffeine, ideally paired with L-theanine. It is the only thing on this page that reliably produces a noticeable effect in a person who is not deficient in anything, it has been tested repeatedly in controlled trials on attention tasks, and it costs a few cents a serving. The important caveat is that a stimulant borrows energy rather than creating it: taken late in the day it degrades the sleep that actually restores you, which is how people end up needing steadily bigger doses. If your tiredness is constant rather than situational, the better answer is not a stronger stimulant — it is finding out why, which usually means a blood test.
Related reading
- → How to read a supplement label (spotting proprietary blends)
- → How to take creatine (dose, timing, and why you can skip loading)
- → Pre-workout vs coffee (what you are actually paying for)
- → Creatine vs pre-workout
- → Best vitamin B12 supplements
- → Best iron supplements
- → Best nootropic supplements (caffeine + L-theanine, in depth)
- → Best pre-workout supplements
- → Best supplements for muscle recovery
Sources
- Vitamin B12 — Fact Sheet for Health Professionals (supplementation "appears to have no beneficial effect on performance in the absence of a nutritional deficit"; no evidence absorption varies by form; groups at risk of deficiency) — NIH Office of Dietary Supplements
- Iron — Fact Sheet for Health Professionals (Tolerable Upper Intake Level of 45 mg/day for adults; groups at risk of deficiency; no route to excrete surplus iron) — NIH Office of Dietary Supplements
- Small Entity Compliance Guide: Label Warning Statements for Iron-Containing Supplements and Drugs (accidental overdose of iron-containing products is a leading cause of fatal poisoning in children under six) — U.S. Food and Drug Administration
- The combined effects of L-theanine and caffeine on cognitive performance and mood — Nutritional Neuroscience, 2008
- Effects of L-theanine and caffeine on attention and reaction time (further controlled-trial evidence for the pairing) — PubMed / peer-reviewed cognitive-performance literature
- International Society of Sports Nutrition position stand: safety and efficacy of creatine supplementation in exercise, sport, and medicine — Journal of the International Society of Sports Nutrition, 2017
- Coenzyme Q10 — evidence summary (strongest signals outside general fatigue) — NIH National Center for Complementary and Integrative Health
- Nutrition Labeling of Dietary Supplements, 21 CFR 101.36 (the rule that permits proprietary-blend labeling to disclose only a combined total) — Electronic Code of Federal Regulations
Last verified: September 10, 2026. See our editorial policy and how we review for details on scoring and update cadence. Canonical URL: https://trustedhealthgear.com/reviews/best-supplements-for-energy.
Nutricost — Nutricost Caffeine with L-Theanine (100 mg each, 240 Capsules)
$13.95 · on Amazon