I added aminos this year to feel my weight training and there is a huge difference. Amino acids are the essential building blocks of proteins, crucial for virtually every bodily function: they build and repair tissues (muscles, skin, hair), create hormones and enzymes, support the immune system, transport nutrients, provide energy, and form neurotransmitters that regulate mood and sleep. Your body needs 20 different types, gets many from food (essential amino acids), and makes others itself (nonessential), all working to keep you growing, functioning, and healthy. LTKBeauty LTKOver40 LTKfitnessgoals