Let me show you the difference between the three generations of zinc. In a normal diet, you should eat more soy products such as coarse flour and tofu, beef and mutton, fish, lean meat, peanuts, sesame seeds, dairy products, cocoa and other foods to supplement zinc. The first generation is inorganic zinc, such as zinc sulfate. It combines with gastric acid to produce zinc chloride. Zinc chloride is a strong corrosive agent, which can stimulate gastrointestinal tract and cause nausea and vomiting. The second generation is organic acid zinc, such as zinc gluconate, zinc acetate and zinc glycyrrhizinate. They are weak acid and weak base salts, which can still generate zinc chloride when combined with gastric acid, so they have certain side effects. Because of its high zinc content, it can antagonize the absorption of nutrients such as calcium and iron. Long-term use will lead to calcium deficiency, anemia and other symptoms. For example, taking zinc gluconate for a long time will cause edema of the lower eyeliner. The third generation of protein zinc: biological zinc, represented by protein zinc. Protein zinc, extracted from protein, contains very low zinc, almost equal to food. It is absolutely safe and has no side effects on human body. You can take it before meals. High activity, can effectively promote the absorption and utilization of various nutrients, and will not antagonize the absorption of nutrients such as calcium and iron, so as to finally achieve the effect of supplementing various nutrients from the diet. Protein zinc is a pure biological preparation with high activity, easy absorption and quick response. And is safe without any hormones and toxic and side effects, which is very beneficial to the absorption of calcium and other trace elements.