Anyone who has ever had chicken pox is at risk of developing shingles. It is caused by the herpes zoster virus that remains dormant in the body until the immune system is weakened. It also causes what is commonly called a cold sore. Take 1000-2000mg of L-Lysine/day as preventative, more at the first sign of tingling/eminent outbreak. Works wonders. Oh, and give up that morning grapefruit. It is full of arginine that depletes your body of lysine.
Lysine has also been found to enhance your ability to absorb calcium into born.
"Although shingles isn't a life-threatening illness, it can sometimes result in a debilitating complication called postherpetic neuralgia which causes nerve pain that lasts for months or even years. Fortunately, there is natural help for shingles, whatever the cause of the reactivation. According to the University of Maryland Medical Center web site, lysine can be used to treat herpes zoster lesions. Lysine, also called L-lysine, is an essential amino acid that can speed recovery time from shingles and reduce the chance of recurrent breakouts of the herpes infections, the University of Maryland site states."
Learn more:
Rheumatoid Arthritis Medication Can Cause Shingles Outbreak