Natural Athletic Performance Enhancers: A Guide to What the Evidence Supports

Natural athletic performance enhancers get more marketing than measurement. Every training plateau produces a new list of powders and roots, and most of those lists never say which ingredients have controlled trials behind them, at what dose, and for which kind of effort. This guide does. We organized it around the questions athletes actually ask, sorted every ingredient by the strength of its evidence, and listed the doses used in the cited studies rather than the doses printed on labels.

Our editorial team reviewed the primary literature for each ingredient below and checked every study identifier against PubMed before it went into this article. Back To Your Roots Herbs sells several of the botanicals discussed here. We do not sell creatine, beta-alanine, or sodium bicarbonate, and we still lead with them, because that is where the evidence is strongest. An honest map is more useful to a training athlete than a flattering one.

Which natural performance enhancers have the strongest evidence?

Natural athletic performance enhancers are legal, food- or plant-derived substances, such as caffeine, dietary nitrate from beetroot (Beta vulgaris), creatine, and adaptogenic herbs like rhodiola (Rhodiola rosea), used to support energy output, endurance, and recovery. The International Olympic Committee names only caffeine, creatine, nitrate, and buffering agents as having good evidence of benefit, with herbs at moderate or preliminary tiers (Maughan et al. 2018, British Journal of Sports Medicine, PMID: 29540367). Caffeine at 3 to 6 mg per kilogram of body mass is the single best-documented dose in the field (Guest et al. 2021, Journal of the International Society of Sports Nutrition, PMID: 33388079).

The table below is the short version of everything that follows. Doses are the amounts used in the cited trials, not recommendations, and every row assumes you have already talked with a healthcare provider if you take medication, compete in a tested sport, or have a diagnosed condition. Rows are grouped by the training goal each ingredient has the best data for: endurance, strength and power, or recovery.

How do caffeine, creatine, beta-alanine, and bicarbonate compare with herbal enhancers?

Caffeine improves endurance, muscular strength, sprint, and jump performance at 3 to 6 mg per kilogram of body mass taken about 60 minutes before exercise, and aerobic endurance shows the most consistent benefit (Guest et al. 2021, PMID: 33388079). A 2025 systematic review of 46 trials in elite athletes found caffeine to be the single most consistent performance enhancer studied (Yu and Ding 2025, Frontiers in Nutrition, PMID: 41058995). Coffee and tea are the usual sources. Guarana seed (Paullinia cupana) and kola nut (Cola acuminata) are the traditional botanical sources from the Amazon basin and West Africa, and our guarana seed capsules supply caffeine in whole-seed form with its naturally occurring catechins and tannins. Doses near 9 mg per kilogram add side effects without adding performance.

Creatine monohydrate raises the creatine stored inside muscle, which supports repeated high-intensity efforts and greater adaptation to training over time. The International Society of Sports Nutrition position stand reports that 3 g daily maintains those stores and that supplementation up to 30 g daily for five years was well tolerated in healthy people (Kreider et al. 2017, PMID: 28615996). It is not a herb, and we do not sell it. It belongs in this article because no botanical product matches its strength and power data.

Beta-alanine at 4 to 6 g daily for at least two to four weeks raises muscle carnosine, a buffer that slows the acid build-up inside working muscle, and improves performance most in open-ended efforts lasting one to four minutes. The only reported side effect is a harmless tingling that divided doses reduce (Trexler et al. 2015, PMID: 26175657).

Sodium bicarbonate at 0.2 to 0.3 g per kilogram, taken 60 to 180 minutes before high-intensity work lasting 30 seconds to 12 minutes, improves muscular endurance and performance in combat sports, cycling, rowing, running, and swimming. Bloating and nausea are common enough that athletes test it in training first, and the ISSN notes that part of its effect may be placebo-driven (Grgic et al. 2021, PMID: 34503527).

Where do herbs fit? Below these four in evidence, above most of what is sold as a natural pre-workout, and with a different job. The best-studied botanicals act on perceived exertion, oxygen use, and recovery markers over weeks of use rather than on a single session’s output.

Do adaptogens like rhodiola improve endurance and recovery?

Rhodiola (Rhodiola rosea) is the adaptogen with the strongest athletic evidence. A 2025 meta-analysis of 26 randomized controlled trials in 668 healthy participants reported improvements in VO2max, time to exhaustion, and time-trial performance, along with lower creatine kinase and lactate after exercise, with larger VO2max gains at doses above 600 mg per day (Wang et al. 2025, Frontiers in Nutrition, PMID: 41080184). A 2023 systematic review of 13 trials drew a useful line: a single dose taken before a session improved endurance and rating of perceived exertion, while daily use over weeks improved anaerobic performance and may lower markers of muscle damage but did not improve endurance (Sanz-Barrio et al. 2023, Phytotherapy Research, PMID: 37495266).

The marker compounds are rosavins and salidroside, phenylpropanoid and phenylethanoid molecules concentrated in the root. The standardized extracts used in most trials carried 3 percent rosavins and 1 percent salidroside, which is the same standard we require for our rhodiola rosea capsules, made from Altai Siberian root. In our sourcing experience, root from high-altitude Altai and Siberian stands tends to test higher for rosavins on its certificate of analysis than lowland cultivated material, which is why the extract standard matters more than the word rhodiola on a label.

Panax ginseng has a longer tradition and a shorter evidence trail for performance. A 2024 umbrella review of 53 meta-analyses on nutrition for exercise-induced muscle damage found that ginseng reduced muscle soreness with moderate-certainty evidence, alongside curcumin and polyphenols (Talebi et al. 2024, Nutrition Reviews, PMID: 37460208). Its effects on endurance measures are inconsistent across trials, so we place it in the recovery column rather than the endurance column. Our red ginseng capsules use six-year Geumsan root, the traditional harvest age in Korean practice.

Do cordyceps and ashwagandha benefit athletes the way rhodiola does?

Not yet at the same evidence level, though both have controlled data. Cordyceps militaris, taken as 4 grams daily of a mushroom blend, improved time to exhaustion by 28 seconds after one week and by 70 seconds after three weeks in a randomized placebo-controlled trial, with VO2max rising 4.8 mL per kg per minute and ventilatory threshold improving only after three weeks of use (Hirsch et al. 2016, Journal of Dietary Supplements, PMID: 27408987). That is one trial of 28 people using a blend, which places cordyceps at a preliminary tier. The signal sits in tolerance of hard efforts and ventilatory threshold rather than raw VO2max, and it appears with consistent daily use. Our cordyceps capsules contain 100 percent Cordyceps militaris fruiting body, the species used in that trial, and our guide to cordyceps for working out covers dosing and timing in detail.

Ashwagandha (Withania somnifera) has a meta-analysis behind it. Four randomized trials in 142 participants found a mean VO2max increase of 3.00 mL per kg per minute with root extract, though heterogeneity was high and the authors called for larger studies (Perez-Gomez et al. 2020, Nutrients, PMID: 32316411). The pooled trials used 500 to 1,000 mg of root extract daily for 8 to 12 weeks. Withanolides, the steroidal lactones in the root, are the compounds those extracts are standardized to. For strength outcomes specifically, our article on ashwagandha and bodybuilding walks through the five trials one by one.

How do beetroot and citrulline raise nitric oxide?

Beetroot (Beta vulgaris) raises nitric oxide through inorganic nitrate. Bacteria on the tongue reduce dietary nitrate to nitrite; the body converts nitrite to nitric oxide, and nitric oxide widens blood vessels and lowers the oxygen cost of submaximal exercise. A systematic review of 23 studies found that beetroot juice improved cardiorespiratory endurance, increased time to exhaustion at submaximal intensities, and may improve performance at the anaerobic threshold (Dominguez et al. 2017, Nutrients, PMID: 28067808). In elite athletes, the picture is weaker. The 2025 review of 46 elite-athlete trials reported limited effects of nitrate in that population (Yu and Ding 2025, PMID: 41058995), which fits a pattern in which highly trained athletes already run close to their nitric oxide ceiling.

Trial protocols commonly used 70 to 140 mL of concentrated beetroot juice, roughly 300 to 600 mg of nitrate, two to three hours before exercise. Two practical notes come from that literature. Antibacterial mouthwash blunts the effect by removing the oral bacteria that perform the first conversion, and red spinach (Amaranthus dubius), arugula, and other leafy greens supply nitrate through the same pathway.

L-citrulline works through the other nitric oxide route. The kidneys convert it to L-arginine, the direct substrate of nitric oxide synthase, and it raises blood arginine more reliably than arginine itself because it bypasses first-pass metabolism in the gut and liver. The performance data for citrulline malate in trained adults are smaller and less consistent than the nitrate data, so we list it as a mechanism worth knowing rather than a first-line choice.

What natural foods support athletic performance?

• Beetroot (Beta vulgaris): dietary nitrate converted to nitric oxide, with 23 studies supporting better endurance and time to exhaustion when taken two to three hours before exercise (Dominguez et al. 2017, PMID: 28067808).
• Coffee and tea: caffeine at 3 to 6 mg per kilogram about 60 minutes before training. A 70 kg athlete lands in range with roughly 200 to 400 mg (Guest et al. 2021, PMID: 33388079).
• Guarana seed and kola nut: the whole-seed botanical caffeine sources traditionally used in the Amazon basin (Paullinia cupana) and West Africa (Cola acuminata), for athletes who prefer caffeine from a plant they can name.
• Tart cherry (Prunus cerasus): anthocyanins studied for muscle soreness and sleep after hard training, usually as 30 mL of concentrate twice daily in trials.
• Turmeric root (Curcuma longa) and ginger (Zingiber officinale): curcumin and gingerols, the two kitchen botanicals with controlled-trial data for post-exercise muscle soreness (Beba et al. 2022, PMID: 35574627; Black et al. 2010, PMID: 20418184).
• Red spinach (Amaranthus dubius) and leafy greens: dietary nitrate through the same pathway as beetroot, with no juice required.
• Alfalfa leaf (Medicago sativa): a nutrient-dense green with a full amino acid profile and vitamin K, useful as an addition to a training diet, not as a protein source.

Which herbs support strength and muscle growth?

Muscle grows when protein synthesis outpaces protein breakdown across weeks of resistance training, and no herb changes that arithmetic. What some botanicals may do is support the hormonal environment and the recovery that training depends on. Tongkat ali (Eurycoma longifolia) is the most studied of these. Its quassinoids, led by eurycomanone, are the compounds of interest, and the human trials to date are small, short, and mixed, so we treat it as an active area of research rather than a settled result. Our guide to tongkat ali for fitness and performance covers the cortisol and hormone data, and our guide Is Turkesterone a Steroid explains why the ecdysteroids in Ajuga turkestanica are not androgens.

Our Athletic Muscle Growth Powder combines Ajuga turkestanica with black maca (Lepidium meyenii) and a standardized green tea extract for athletes who want a plant-based stack to mix into a post-training shake. It supports a training program. It does not replace one.

Alfalfa (Medicago sativa) appeared in the earlier version of this guide as a recovery herb because its leaf carries all nine essential amino acids, including the branched-chain amino acids leucine, isoleucine, and valine. That is accurate, and it is also true that the total protein in a serving of leaf powder is small. Treat our alfalfa powder as a nutrient-dense green, not as a protein source. Whey, eggs, legumes, and meat do that job.

Which herbs support recovery after training?

Turmeric (Curcuma longa, active compound curcumin) and ginger (Zingiber officinale, active compounds gingerols and shogaols) are the recovery botanicals with controlled-trial data. A dose-response meta-analysis of ten randomized trials found that curcumin supplementation lowered serum creatine kinase by about 66 IU per liter, reduced muscle soreness scores by 0.56 points on a visual analogue scale, and improved maximal voluntary contraction and range of motion after damaging exercise (Beba et al. 2022, Phytotherapy Research, PMID: 35574627). Ginger at 2 grams daily for 11 days reduced muscle pain 24 hours after eccentric exercise by roughly 25 percent compared with placebo, whether the ginger was raw or heat-treated (Black et al. 2010, Journal of Pain, PMID: 20418184).

The honest caveat: a 2023 meta-analysis of the curcumin trials found no statistically significant effect on muscle damage markers, soreness, or inflammation at any time point and called for better-designed studies (Oxley and Peart 2023, Nutrition and Health, PMID: 37408367). The two reviews disagree partly because the trials used different curcumin formulations. Plain curcumin is poorly absorbed, and the positive trials mostly used lipid-based or piperine-enhanced forms. Our organic turmeric powder is whole rhizome from Erode in Tamil Nadu, India’s geographically recognized turmeric region, and from our hands-on use, we pair it with black pepper and a fat source for exactly that reason. The right framing for both herbs is support for a healthy inflammatory response after exercise, not a substitute for sleep, protein, and rest days.

What are the safety risks of performance supplements?

The main risks of performance supplements are inadvertent ingestion of substances prohibited under anti-doping codes through contaminated or mislabeled products, dose-related side effects, and herb-drug interactions. The IOC consensus statement describes inadvertent ingestion of prohibited substances as a known risk of some supplements and recommends expert assessment before an athlete starts any of them (Maughan et al. 2018, PMID: 29540367). The World Anti-Doping Agency Prohibited List is updated every January, and tested athletes should read it directly rather than trusting a label.

• Contamination: drug-tested athletes should choose products carrying a third-party certification for sport, such as NSF Certified for Sport or Informed Sport. Single-herb products from suppliers who publish batch testing lower the risk. Proprietary blends with undisclosed amounts raise it.
• Caffeine: sleep loss, anxiety, and a racing heart rise sharply near 9 mg per kilogram. Genetic differences in caffeine metabolism explain much of the variation between people (Guest et al. 2021, PMID: 33388079). Caffeine is on the WADA monitoring program but is not prohibited.
• Beta-alanine: tingling of the skin, which is harmless and fades with divided doses (Trexler et al. 2015, PMID: 26175657).
• Sodium bicarbonate: bloating, nausea, and vomiting. Test it in training, never for the first time in competition (Grgic et al. 2021, PMID: 34503527).
• Creatine: a kilogram or two of water weight in the first weeks. People with kidney disease should ask a physician first.
• Adaptogens: rhodiola and ashwagandha can interact with thyroid medication, sedatives, immunosuppressants, and some antidepressants. Ashwagandha is not recommended during pregnancy.
• Turmeric, ginger, and Panax ginseng: caution with anticoagulant and antiplatelet drugs. Panax ginseng may affect blood glucose in people taking diabetes medication.
• Pregnancy, nursing, and athletes under 18: none of the ingredients in this article have adequate safety data in these groups. Talk with a healthcare provider.

Supplements support a program. They do not replace one. In our editorial team’s experience reviewing ingredient labels, the products that cause trouble are rarely the single herbs. They are the blends that will not tell you what is inside.

Related Reading

Continue with our guides to cordyceps for working out, ashwagandha and bodybuilding, tongkat ali for fitness and performance, and shilajit for bodybuilding, or browse the full athletic performance collection.