April 4, 2026 · 4 min read

Cycling Supplements — What Actually Works and What's Marketing

The supplement market promises more power, faster recovery, more energy. Most of it is marketing. A handful of substances have solid scientific backing. Here's what actually works in cycling, what's unnecessary, and what can hurt you.

Supplements with confirmed effectiveness

Caffeine

The best-studied legal ergogenic aid. 3–6 mg/kg body weight 30–60 minutes before training improves performance by 2–4%. For a 75 kg cyclist that's 225–450 mg — roughly 2–4 coffees. Effective at every level.

Creatine

More useful in strength training than pure cycling, but it helps with sprints and short Z6–Z7 intervals. 3–5 g daily, no loading phase needed. Can cause 1–2 kg of weight gain (water retention in muscle).

Beta-alanine

Buffers acid in muscles, helping efforts lasting 1–4 minutes (Z5–Z6 intervals). 3–6 g daily, split into smaller doses to avoid skin tingling. The effect builds over 2–4 weeks.

Electrolytes (sodium, potassium, magnesium)

Less a supplement than a necessity on long, hot rides. Sodium is the most important — you lose it through sweat. Target 500–1000 mg sodium per liter of drink during intense efforts.

"It depends" supplements

• Vitamin D — essential, but only if you're deficient (common in temperate climates in winter). Get a blood test before supplementing. 2000–4000 IU daily with a confirmed deficiency.
• Iron — critical for oxygen transport, but excess is toxic. Never supplement iron without a blood test (ferritin, blood count).
• Omega-3 — may reduce inflammation. Evidence is promising but not conclusive. 1–2 g daily EPA+DHA is a reasonable dose.

Which supplements have no real evidence behind them?

BCAAs are unnecessary if you're already eating enough protein (1.6–2.0 g/kg) — the extra branched-chain amino acids add nothing on top. Glutamine has no evidence for improved recovery in healthy athletes. Collagen might help joints, but the evidence is weak and dosing is unclear. Most "pre-workouts" work because of the caffeine in them — the rest of the ingredients are filler.

Food first, supplements second

No supplement replaces a solid diet. Before spending money on capsules, make sure you're eating enough carbohydrate, protein, vegetables, and fruit. A supplement is 1–3% on top — the foundation is 97% food, sleep, and training.

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