L-Lysine and B6 Combination Vegan-friendly capsule shell L-Lysine is an essential amino acid the body can't make and needs to absorb from food. L-Lysine is an essential amino acid - this means that the body can't make it, L-Lysine amino acid has to be absorbed via the stomach, this achieved by having a balanced and healthy diet. The incorporation of Vitamin B6 into this supplement means it is active in assisting bone health, as Lysine helps the body to absorb calcium.