And while they’re popular for their ability to help people gain and retain muscle, these supplements aren’t just for body builders — or even people with regular gym memberships.

Optimum Nutrition claims its Gold Standard 100 per cent Whey is the world’s “best-selling ... find they perform better in the gym if they ingest a protein shake 30-45 minutes beforehand.

“15 to 20 grams of protein per serving is typically sufficient in a protein shake, though the exact amount can vary depending on factors such as body weight, physical activity level, and health ...