Amino acids are the building blocks of protein; they are needed to build various proteins used in the growth, repair, and maintenance of body tissue. 'Non-essential' amino acids are those that the body can synthesize; 'essential' amino acids can only be obtained by ingestion. The richest natural sources of essential amino acids are found in protein rich foods including meat, fish, eggs and dairy products; consequently, most people get a sufficient amount of these in their normal diet. However, vegetarians or people on a strict diet, body-builders, for example, may not be receiving enough proteins and amino acids in their food.

A deficiency of amino acids means that the vital organs do not get their required amount, and so the body must break down protein in the muscle, and use these to supply the parts of the body where they are most needed. Acetyl Carnitine deficiency, for example, may be indicated by muscle fatigue and cramping. Alpha Lipoic Acid, an effective anti-toxidant, may be taken to help ward off free radicals in your body, it is also beneficial to diabetes sufferers, as it helps control blood sugar levels and enhances the effects of vitamin C and vitamin E. Using these supplements is a convenient and easy way to ensure you get all the amino acids you require.