02-19-2013, 05:43 AM
there is a formula called rehmannia endurance by planetary herbals. it is based on a classical chinese formula and is specifically for strengthening the yin. rehmannia is a primary herb for the kidneys . ron teegarden recommends this for people over 50 . his web site i believe is dragon herbs. i bought it from vitacost for i believe 14 bucks for a 2 month supply so pretty good.