The Biohacker's Home Medicine Cabinet — 10 Supplements With the Strongest Evidence

The dietary supplement market today counts tens of thousands of products, the vast majority of which have, at best, a single weak animal study, an in-vitro test-tube study, or no research at all beyond the manufacturer's marketing materials. Amid this flood, it's easy to lose sight of the fact that a handful of substances — often the cheapest and least 'trendy' — have dozens of independent clinical trials on humans behind them, including meta-analyses and systematic reviews.

This guide isn't a 'you must take this' list — it's more of a priority map: what's worth considering first, before getting interested in more niche, less-studied compounds marketed as the latest breakthrough in biohacking. The order of this list isn't random — it roughly reflects the strength and volume of available scientific evidence, not popularity on social media.

Creatine monohydrate remains one of the few supplements for which scientific consensus is nearly unanimous: it increases strength, power, and lean body mass in people who do resistance training, and a growing body of research also points to potential cognitive benefits, especially under sleep deprivation. Typical dosing is 3–5 g daily on an ongoing basis, with no need for a loading phase with higher doses — though a loading phase (around 20 g daily for 5–7 days) can speed up reaching full muscle creatine saturation.

Vitamin D plays a role in calcium metabolism, immune system function, and bone health, and its deficiency is common in countries with limited sun exposure for much of the year, especially in autumn and winter. Unlike many trendy supplements, the benefit of vitamin D supplementation in people with an actual deficiency is relatively well documented, though the effects of supplementation in people who already have adequate levels are considerably more modest.

A common feature of these three supplements is that they don't act as a 'booster' for someone without a deficiency — their real value shows up mainly in people whose diet genuinely doesn't cover their needs for that particular nutrient. This sets them apart from supplements marketed as universal 'boosters' that work regardless of a person's baseline status.

Whey or plant-based protein powder (covered in more detail in our ranking of plant protein for vegans) and fiber powder (e.g. psyllium husk, inulin) aren't supplements in the classic sense of 'improving' physiology — they're simply a convenient way to fill in two nutrients that many diets provide in amounts lower than recommended. Their value is directly proportional to how large the gap is between the current diet and recommended protein and fiber intake.

Melatonin can be effective for circadian rhythm disruptions — such as jet lag, shift work, or delayed sleep phase — but the evidence for its effectiveness as a general sleep aid in people without circadian rhythm disturbances is considerably weaker than popular belief would suggest. Typical therapeutic doses (0.5–3 mg) are also much lower than what's found in many popular products on the market, where 5–10 mg is the norm, even though a higher dose doesn't automatically mean a better effect.

Caffeine is one of the most thoroughly studied ergogenic substances in the world — it improves exercise performance, alertness, and perceived exertion at doses of roughly 3–6 mg per kilogram of body weight, taken about 30–60 minutes before exercise. Electrolytes (sodium, potassium, magnesium) become important during prolonged, intense physical exertion combined with heavy sweating, but for someone with a moderately active lifestyle, a normal, balanced diet is usually enough to replenish them without additional supplementation.

A good home biohacker's cabinet isn't a collection of the most expensive or trendiest products — it's a small set of well-studied substances chosen to match a specific person's real, confirmed deficiencies or goals. Instead of chasing the next novelty marketed as a breakthrough, it's worth first making sure these few basic, well-documented items are already at the right level in your diet.