If this protective sheath degenerates a "shorting out" of the message occurs and the signal never gets to the appropriate part of the body.  This is what happens in the disease multiple sclerosis.

Histidine helps to manufacture red and white blood cells in the bone marrow.  Red blood cells are oxygen-carrying cells.  The medical term for a lack of oxygen carrying ability is anemia and it results in fatigue.  White blood cells are part of our immune system.  They protect our body from harmful microorganisms (infection) and monitor our own cells to eliminate those that work improperly (cancer).

Histamine is a chemical that is derived from histidine.  It is well known as the cause of allergic symptoms like a runny nose and itchy, watery eyes.  However histamine is necessary for certain bodily functions like the production of stomach acid and sexual arousal and pleasure.  Histidine can be supplemented for the following conditions: multiple sclerosis, nerve degeneration, anemia, low immune functioning, hypertension, heavy metal toxicity, rheumatoid arthritis, impotence, low libido and indigestion.

The biologically active form of histidine is L-histidine.  It is found in capsules.  To increase your production of histamine supplement with L-histidine, vitamin B3 and vitamin B6.  Take amino acid supplements at least 1/2 hour before or after a meal to maximize their absorption.  If you take an individual amino acid supplement for longer than one month, add an amino acid complex to the protocol to prevent the deficiency of other amino acids.

Methionine counteracts the effect of histidine.  Individuals with schizophrenia, anxiety or bipolar disorder should not use histidine.