The phrase "protein matrix" refers to the structure or framework of proteins in a biological system. It describes the arrangement and organization of proteins, which form a solid or gel-like substance. Full definition
It makes sense since bones form around a collagen - rich protein matrix. (theveganrd.com)
Product 2: Pharma Whey ® HT + Bars: Pharma Whey ® HT + Bars contain 30g of protein per delicious bar, derived from a triple - sourced protein matrix of whey protein, milk protein and soya protein isolate, Pharma Whey ® HT + bar also contains only 3g of sugar per 75g bar and a whopping 9.3 g of dietary fibre. (phd-supplements.com)
This degree of naturally present leucine along with its complete amino acid pool, give a unique nutritional fingerprint to the native whey protein matrix. (pronativ.com)