Lysine inhibits viruses. Its use along with vitamin C, zinc and vitamin A helps eliminate virus infections. Vitamin C protects this amino acid while in the body so that lysine plus vitamin C has a much stronger anti-virus effect than if either is used separately. Lysine also influences the female reproductive cycle. Lack of adequate lysine in the diet may cause headaches, dizziness, nausea and incipient anaemia. The main sources of this amino acid are most kinds of nuts, seeds, vegetables and sub-acid fruits. Lysine upsets in the body have also been associated with pneumonia, nephrosis and acidosis as well as malnutrition and rickets in children. It is considered a natural remedy for cold, sores, shingles and genital herpes. In a study published in 1983, a group of researchers polled over 1,500 people whose daily intake of lysine was over 900 mg 88 per cent said that lysine seemed to reduce the severity of their attacks of herpes virus and accelerated the healing time. These results have, however, been disputes by some scientists.