Herbs to Optimize Athletic Performance

Best for: pre-workout energy and focus

Guarana seeds are one of the most caffeine-dense plant materials on earth — roughly 2–8% caffeine by weight, versus about 1–3% for coffee beans. That’s the whole story of why it works as a pre-workout: it’s caffeine, and caffeine is the best-proven ergogenic aid there is [1].

Where the marketing overreaches is everything beyond the caffeine. You’ll see guarana described as “protecting the heart” and improving cardiac contractile force — I included versions of that claim in the original post, and it isn’t supported by human evidence. The cardiovascular literature on guarana is mostly about caffeine-driven increases in heart rate and blood pressure, not a protective effect.

So treat guarana as what it is: a convenient, slow-releasing caffeine source. Dose it by its caffeine content, not by grams of powder, and don’t stack it on top of coffee and a pre-workout without doing the math.

Best for: sustained daytime energy; fat oxidation during steady-state work

Yerba maté is another caffeine plant, this time paired with theobromine and a large dose of polyphenols. Many people find its energy smoother and longer than coffee — plausibly from the theobromine and the way it’s sipped, though that “no jitters” reputation is more experiential than proven.

The more interesting finding is metabolic. In a controlled trial, about 1 gram of yerba maté before exercise raised fat oxidation and energy expenditure by over 20% at submaximal intensities [2]. That’s a genuine, measured effect — but note the honest limit: it shifts fuel use, and hasn’t been shown to improve actual performance numbers like power output or time-trial speed. Useful for steady-state and body-composition goals; not a demonstrated power booster.

Best for: acute endurance, lowering perceived effort

Rhodiola is the standout of the adaptogen group. In a well-cited crossover trial, a single acute dose improved time-to-exhaustion and lowered perceived exertion — and, tellingly, four weeks of daily loading didn’t add anything on top of that acute effect [8]. A later study found an acute 3 mg/kg dose produced a faster 6-mile time trial and lower heart rate, though it didn’t move perceived exertion in that trial [9].

So the realistic read is: a modest but real acute benefit, best taken before a hard session rather than loaded for weeks. It won’t rebuild your engine — it takes the edge off the effort so you can hold a bit more.

Best for: aerobic capacity, building a base

A quick naming note: the wild “caterpillar fungus” is Ophiocordyceps sinensis, but almost nothing sold in a bottle is actually that — commercial products are cultivated Cordyceps militaris or the fermented mycelium Cs-4, and both have real research behind them.

In healthy older adults, 3 g/day of Cs-4 improved VO₂max and metabolic threshold [10], and a C. militaris blend improved high-intensity exercise tolerance [11]. The effect is clearest in untrained or older adults; once you’re already highly trained there’s less headroom for it to add, so think of it as a base-building tool rather than something that keeps paying off indefinitely.

Pick a properly identified C. militaris or Cs-4 product, and take it daily over weeks rather than expecting a same-day effect.

Best for: endurance, taken as a longer-term adaptogen

Eleuthero carries the reputation of the adaptogen Soviet athletes supposedly used. The controlled evidence is genuinely mixed: one eight-week trial at 800 mg/day reported improved endurance, VO₂, and fat oxidation [12], while a cycling study at 1,200 mg/day found no measurable change in fuel use or 10 km time-trial performance [13], and a review found no consistent effect across studies [14].

Worth trying as part of a broader adaptogen rotation if the endurance angle appeals to you — just treat any benefit as likely modest rather than the dramatic version of the story.

Best for: general vitality and tonic use

Panax ginseng is one of the most established tonic herbs there is, and it shows up in nearly every “herbs for athletes” list, including my original one. But when the controlled trials look specifically at performance — VO₂max, work capacity, fatigue — they haven’t found a reliable ergogenic effect [19].

That’s not a knock on ginseng as a tonic — it just means the “it’ll make you a better athlete” framing isn’t the right way to use it. If you already take it for general vitality, there’s no reason to stop; just don’t expect it to move your numbers the way ashwagandha or rhodiola can.

Best for: strength, VO₂max, recovery, and reduced muscle damage

If you only add one herb from this article for the gym, ashwagandha is the defensible pick. Unlike most of this list, it has actual randomized trials aimed at athletic outcomes. In resistance-trained protocols, 600 mg/day for eight weeks produced larger gains in bench-press and leg strength, more muscle size, and lower markers of exercise-induced muscle damage than placebo [4]. A separate trial in athletic adults found a meaningful bump in VO₂max over 12 weeks [3], and a 2021 systematic review and meta-analysis concluded it outperforms placebo for strength, VO₂max, and recovery in both men and women [5].

The honest asterisks: the trials are small, and many come from groups affiliated with a specific branded extract — so treat the size of the effect cautiously even though the direction is consistent. It’s also thyroid-active and best avoided in pregnancy (see safety). But as herbs go, this is the strongest strength-and-recovery story here.

Best for: strength / muscle (early evidence)

Ecdysterone is the compound doing the heavy lifting behind a lot of “insect protein” and suma hype — but the one credible human study used spinach-derived ecdysterone, not any exotic source. In a 10-week resistance-training trial, supplemented groups gained significantly more muscle mass and one-rep-max bench strength than placebo [17].

That’s a striking result — striking enough that the researchers recommended ecdysterone be considered for the WADA prohibited list, and the anti-doping world has been studying it as a “non-conventional anabolic agent.” Two cautions before you get excited: it’s essentially a single study awaiting independent replication, and many commercial ecdysterone products contain far less than the label claims. Competitive athletes should also be aware of its anti-doping status.

Best for: perceived energy, libido, general nutrition

Maca is worth a spot in an athlete’s cupboard, but it’s worth using for what it actually does. Maca is non-hormonal — controlled trials consistently show it doesn’t change serum testosterone or other sex hormones [16]. Where it’s well-supported is libido, mood, and perceived energy.

The one cycling trial in trained men found sexual desire improved versus placebo, and 40 km time-trial times improved versus the riders’ own baseline [15]. So maca is a genuinely nutrient-dense Andean food that can help how energetic you feel day to day — reach for it for that, not as a testosterone or strength aid.

Best for: traditional tonic use

Suma, sometimes marketed as “Brazilian ginseng,” is a longstanding adaptogenic tradition, and its ecdysteroid and pfaffic-acid content is the basis for that reputation. The strength/endurance research on those compounds so far is animal and test-tube work rather than controlled human trials.

If the ecdysterone angle is what draws you to suma, the spinach-derived study under Ecdysterone above is the one place that specific effect has actually been tested in people — worth reading alongside this one.

Best for: traditional tonic use; nutritional zinc/protein

Black ant isn’t a plant, but it’s used like a tonic herb, so it earns its spot on the list. It’s genuinely high in zinc and protein, and it does contain ecdysterone — a solid nutritional profile in its own right. The direct muscle/performance research on black ant itself hasn’t been done yet, so treat the ecdysterone content as a reason for interest rather than a proven effect; the spinach study under Ecdysterone above is the human data point to lean on for now.

A solid, mineral-rich traditional tonic either way.

Best for: recovery, muscle soreness (DOMS), sleep

Tart cherry is the recovery herb with the cleanest data. In marathon runners, Montmorency cherry juice taken for five days before and two days after the race sped the recovery of muscle strength and lowered inflammation and oxidative-stress markers [6]. A 2021 meta-analysis of 14 studies found a moderate benefit for strength recovery and a smaller one for soreness [7].

Two honest limits: it’s a recovery aid, not a performance booster — it helps you bounce back, not go faster on the day — and blunting exercise-induced inflammation isn’t always desirable (some of that inflammation drives adaptation). Best saved for congested race/competition periods rather than everyday training.

Best for: muscle soreness / DOMS

Ginger is a modest, believable win. In two randomized trials, 2 g/day of ginger for 11 straight days cut next-day muscle pain from eccentric exercise by roughly a quarter versus placebo [18]. The important nuance: the benefit came from consistent daily use — a single dose taken only after a workout didn’t do much.

It’s not dramatic, and it won’t make you stronger. But as a cheap, food-grade anti-inflammatory that genuinely takes a little edge off soreness, it’s an easy one to like.

Best for: subjective recovery, sleep, pain

Cannabis earns its athletic reputation mainly through topical and oral CBD for muscle relaxation, pain, and sleep — and I’ll be straight that I overstated this before. The recovery evidence is preliminary and mechanistic; there’s no high-quality trial establishing that CBD meaningfully speeds recovery. It’s plausible and many athletes like it, but “incredible muscle relaxant that speeds recovery” oversells what’s actually been shown. And smoking anything, obviously, won’t help your performance.

The part that isn’t optional to know is the anti-doping status. Under the WADA rules, THC is prohibited in competition (with a urinary threshold of 150 ng/mL), while CBD itself was removed from the prohibited list in 2018 and is permitted [20, 21]. The catch: many CBD products are contaminated with enough THC to trigger a positive test. If you’re tested, only use CBD that’s been third-party verified as THC-free.

This has become especially relevant with the rise of CBD oils — worth reading if you’re weighing one up.