Supplements 101: What Actually Has Evidence Behind It

Important: this is educational content, not medical advice. Supplements can interact with medications and conditions — talk to your doctor or a registered dietitian before starting anything new.

The supplement industry is worth tens of billions of dollars, and most of it runs on marketing, not science. Strip away the hype and the list of supplements with genuinely strong evidence is surprisingly short. Here it is, organized honestly.

Tier 1: Strong evidence

Creatine monohydrate. The most studied sports supplement in history. Consistently shown to improve strength and muscle gain; 3–5 g daily, no loading phase needed, no cycling needed. Cheap, safe for healthy people, and effective. Look for "creatine monohydrate" — nothing fancier required.

Protein powder. Not magic — just convenient food. Useful when you cannot hit your protein target with meals (see our protein guide). Whey, casein, or plant blends all work; pick based on digestion and budget.

Vitamin D. Only if you are deficient — and many indoor workers are. Get bloodwork first; supplementing blindly is guessing. Your doctor can tell you in one test.

Caffeine. Effective pre-workout stimulant (improved focus and performance), but it is also the reason half the gym cannot sleep. Dose matters, timing matters more — nothing within 8 hours of bed.

Tier 2: Promising, not essential

Omega-3 (EPA/DHA). Good evidence for general health, especially if you rarely eat fatty fish. Modest direct evidence for muscle building — take it for health, not gains.

Magnesium. Many people under-consume it; deficiency hurts sleep and recovery. Food first (nuts, seeds, leafy greens); supplement only if intake is low.

Tier 3: Save your money

Fat burners. Mostly caffeine in a fancy bottle with unproven extras. No pill meaningfully burns fat — that is what training and food do.

BCAAs. Useless if you eat enough total protein (which already contains BCAAs). Expensive flavored water for most people.

"Testosterone boosters" and detox blends. No credible evidence; some contain ingredients that can actually harm. Hard pass.

Collagen for muscle. Incomplete protein, poor for muscle building. Fine for skin/hair goals, not a muscle supplement.

How to buy smart

• Third-party tested: look for NSF Certified for Sport or Informed-Sport seals — they verify the label matches the bottle and screen for banned substances.
• Short ingredient lists: "creatine monohydrate" should contain creatine monohydrate. "Proprietary blend" means they are hiding doses — avoid.
• No mega-doses: more is not better with vitamins and minerals; some are toxic in excess.

The honest supplement stack for most healthy trainees: creatine monohydrate, protein powder if needed, and whatever your bloodwork says you are missing. Everything else is optional — spend the savings on quality food.