Zinc (Picolinate/Bisglycinate) Intro: Zinc supports immune function and tissue repair, but the biggest gains typically appear when zinc status is low. Different forms emphasize absorption and GI tolerance; picolinate and bisglycinate are common. Purafit rates zinc strongest for immune support and recovery, with hormone support more context-dependent. On labels, avoid excessive doses and remember that long-term high zinc can disrupt copper balance, so balance matters.