zinc is involved in hundreds of processes in the body. up to 20% of the zinc in our bodies is present in the skin where it plays a role in tissue repair & renewal. zinc also contributes to:, the normal function of the immune system, the maintenance of normal bones., the maintenance of normal testosterone concentrations in the blood a staggering one in three adults in the uk receives less than the reference nutrient intake (rni) for this mineral. this is largely a result of refining processes which remove up to 90% of the available zinc content from cereal grains. many nutritionists now prefer the citrate form of zinc used in this product over all other types of zinc compound because citrates are known to be readily absorbed. pharmaceutical grade material uk- made & tested highly absorbed citrate form highly absorbed citrate form