Dietary supplement with vitamins C, D, zinc and histidine The VITAMIN C 300 Depot+Zinc+Histidine+D capsules are a dietary supplement containing vitamins C and D, zinc, and histidine. The encapsulated vitamin C is released gradually, ensuring a continuous supply to the body and maintaining immune system function and cell protection against oxidative stress. Vitamin D is also involved in the absorption and utilization of calcium and phosphorus and supports the immune system. One capsule contains: 300 mg vitamin C, 10 mg zinc, 24 mg histidine, and 1,000 IU vitamin D. Application : Take 1 capsule per day whole with some liquid.