Can I replace my regular protein powder with collagen or use them interchangeably?

No, you can’t. Collagen does not contain all 9 essential amino acids. Essential amino acids are those our body can’t produce and we must obtain them from our diet by either eating animal protein, a combination of vegetable proteins or by taking a protein supplement. You also can’t do it the other way around and replace collagen supplement with a regular protein powder. In a nutshell, collagen peptides are being used for connective tissues (ligaments, tendons, myofascial, bones, skin, gut lining etc.) and other protein powders (whey, pea, soy etc.) are used to cover our essential amino acid needs and to build lean muscle mass.