The best is the fourth generation protein zinc. Protein zinc contains zinc with the same structure as human body, so its absorption rate is as high as 90%, which is the highest in protein zinc at present. Protein zinc, the fourth generation of Hincheon is one of the best, occupying a large share in the market, and its specific name should be Hincheon Kogi Star Film. Now there are octyl gluconate and so on, all of which are second-generation zinc, which will also affect the absorption of calcium.