20g Protein: What It Actually Does for Your Body

A 20g protein serving is the magic number in sports nutrition research. The classic 2009 study from Moore et al. found that 20g of high-quality protein post-exercise maximally stimulated muscle protein synthesis in young men — and that doubling to 40g produced no additional benefit. Subsequent research has refined this picture, but 20g remains the benchmark.

For older adults (60+), the threshold shifts up. Research from the same group found that 35–40g was needed to maximally stimulate MPS in older subjects, thanks to anabolic resistance. The lesson: aging muscles need more protein per dose.

What does 20g of protein actually do? It spikes muscle protein synthesis for 3–5 hours. It provides the amino acid leucine (~2.5g), which is the trigger that flips the MPS switch. It contributes meaningfully to your daily protein target without crowding out other meals.

What 20g doesn't do: build muscle on its own. Protein is the raw material; resistance training is the stimulus. Eating protein without lifting weights makes you a well-fed person, not a more muscular one. The combination of training + protein is what drives adaptation.

Practical ways to get 20g of protein: 3 whole eggs + 2 egg whites, 3/4 cup of Greek yogurt + a scoop of whey, 3 oz of chicken breast, 1 cup of cottage cheese, half a cup of lentils + half a cup of quinoa, or one pouch of Glÿka.

Timing: distribute 20g doses across 3–4 meals rather than loading 60g in one sitting. The body can only use so much protein at once for MPS; the rest goes to energy or other processes. Three 20g doses beat one 60g dose for muscle synthesis, despite being the same daily total.

Bottom line: 20g per serving is a real number backed by real research. It's why we formulated Glÿka at exactly 20g per serving — not 15g (too little to maximally stimulate MPS) and not 40g (wasteful for most people). The number is not arbitrary.