I have had cold sores and used this and thought it helped, but don’t know about shingles. Cheap, worth a try, no side affects. Lemon balm is easy to grow. Makes a nice winter time tea. Relaxing. Good luck!
http://voices.yahoo.com/fight-herpes-cold-sores-shingles-lemon-balm-2346476.html
“... I have seen client after client complain of constant misery caused by herpes-family viruses, including herpes simplex 1 (cold sores), herpes simplex 2 (genital herpes), and herpes zoster (shingles).
In all of these cases, my clients said that they felt dramatic improvement in all of these herpes-related symptoms within a matter of minutes or hours after using lemon balm internally or topically...”
Worth a try.
thanks!