GREAT BOOK....LEARNED THAT I CANNOT DO WITHOUT CHROMIUM PICOLINATE. IT REALLY HELPS KEEPING MY HYOGLYCEMIA UNDER CONTROL, AND KEEPS MY BLOOD SUGAR LEVEL. FOR AN 80 YR.OLD, I FIND IT STRENGTHENING MY IMMUNE SYSTEM THUS A GOOD BET THAT IT HAS INCREASED MY LIFESPAN. WOULDN'T BE WITHOUT IT.