Walk into any supplement store and you’ll face an overwhelming wall of products making bold performance claims. Creatine, BCAAs, and electrolytes are three of the most popular — and also three of the most misunderstood. Here’s what the evidence actually says about each, and who actually benefits from taking them.
Creatine: the most evidence-backed supplement in sports nutrition
Creatine monohydrate has one of the most robust evidence bases of any supplement in existence. Over 500 studies support its safety and efficacy. It works by increasing phosphocreatine stores in muscle, which speeds ATP regeneration during short-duration, high-intensity efforts (sprints, heavy lifts, explosive movements). The effects are well-documented: 5–15% improvements in maximum strength output, increased training volume capacity, and enhanced muscle creatine saturation that supports training adaptation over time.
The standard protocol: 3–5g of creatine monohydrate daily, indefinitely, without a loading phase (loading speeds saturation but isn’t necessary). Creatine monohydrate is the only form with consistent evidence — “creatine HCl” and other variants are more expensive with no demonstrated superiority. It’s one of the few supplements worth recommending broadly to strength-focused athletes.
BCAAs: mostly unnecessary for people eating adequate protein
Branched-chain amino acids (leucine, isoleucine, valine) are marketed aggressively for muscle building and recovery. The inconvenient truth: if you’re consuming adequate total protein (1.6–2.2g/kg/day), your BCAA needs are already met from whole food sources. BCAAs stimulate muscle protein synthesis — but only marginally compared to complete protein sources that contain BCAAs plus all other essential amino acids. BCAA supplements add cost without meaningful additional benefit for most athletes with adequate protein intake. The exception is fasted training, where consuming BCAAs before exercise can reduce muscle protein breakdown without the caloric load of a full meal.
Electrolytes: real need, often overcomplicated
Electrolytes — sodium, potassium, magnesium, calcium, and chloride — are essential for muscle contraction, fluid balance, and nerve signaling. Sweat depletes primarily sodium and, to a lesser extent, potassium. For workouts under 60 minutes in moderate conditions, plain water is typically sufficient. For sessions exceeding 60–90 minutes, particularly in heat, electrolyte replacement becomes genuinely important for sustaining performance and preventing hyponatremia (dangerous low sodium from excessive water consumption).
Proprietary electrolyte drinks are rarely necessary. Sodium in any form (salt, salty foods), potassium from fruit, and magnesium from nuts and seeds cover electrolyte needs efficiently. Sports drinks add sugar to drive fluid absorption — useful during endurance events, less necessary for general gym training.