From your description, you bought it from someone else, not directly from USANA. USANA adopts membership factory direct sales. Everyone can join the club and buy products from the company at a unified membership price. There is no intermediate link to ensure the safety and reliability of products. So first of all, make sure that what you buy is genuine. There are many counterfeit products and expired products on the market.

It is normal for the skin to turn yellow after using USANA products, because the basic nutrients of USANA contain β-carotene, which will cause the skin to turn yellow and gradually improve.

Beta carotene is a substitute for vitamin A. Most nutritional products are directly supplemented with vitamin A. Vitamin A is fat-soluble and cannot be excreted with urine. It is a potential toxin, which will cause harm to human body if ingested in large quantities, especially if pregnant women ingest vitamin A in large quantities, which will cause birth defects of babies, and if children ingest vitamin A in large quantities, it will cause poisoning, manifested as dry skin, fragile nails, irritability, nausea, vomiting and fatigue.

A good nutrition is to replace vitamin A with beta carotene, which can be converted into vitamin A when the body needs it, and exists in the form of beta carotene when it is not needed. Beta carotene is water-soluble, and excessive intake will be excreted with urine, which will not cause harm to human body.

Similarly, iron is a potential toxin. If the nutrition contains iron, you should be very careful. A large amount of iron supplementation can also cause iron poisoning and harm to the human body. Good nutrition does not contain iron. As long as enough other nutrients are supplemented, iron supplemented in the normal diet can meet the needs of the human body.

If you have other questions, you can also communicate together.