It is a zinc made from food so it is 100% absorbable vs metallic minerals. I recommend reading. Why am I always so tired? By Melissa Smith. Anybody gotten a hair mineral analysis? This really is'nt that hard you just have to be deliberate and give high doses of the minerals you take for AF. If you need 30,000 mg of Vitamin C to give you diahriaha then take that much. Read about titration. Did you know they have done studys on animals exposed the the same stress, ones with a certain amount of Vitamin C did NOT release as much cortisol. Ones without the C release 3 times the amount. Important, if you can save your adrenals for excess stress they will rebuild that much quicker. Humans are one of the few animals that donot make vitamin c.