Are you a vegetarian or a vegan? Besides vitamin B12, depending upon what you eat and the supplements you take, you can find your diet somewhat low in zinc, long chain omega 3 fatty acids, and even some amino acids. One of these amino acids is called creatine, and the best source is meat.
Researchers who study cognition and athletic performance simply love giving vegetarians creatine supplements. This practice might seem curious until you look at the following facts…
Source: Your Brain on Creatine
Most people don’t understand about non-essential amino acids is that you don’t need them – your body can synthesize them. Just not efficiently. Unless you’re getting your non-essential aminos from your food or supplements – you’re probably non-essential amino acid deficient.