Founded in 1935, GNC is a long-established health and nutritional food chain in the United States, and has been rated as the No. 1 vitamin and nutritional food franchise brand in the United States for four consecutive years. As an industry standard reference company, GNC quality control system has been selected by the US FDA as a template for the production of dietary supplement products. GNC is still a health supplement giant, but its sales have stagnated for several years due to its traditional sales model.
 
Multivitamin is GNC's flagship product, with rich product types, complete classifications, and high cost performance, and the daily supplement costs about 1 yuan. For example, Jian'anxi MEGA MEN Men's Nutrition Tablets contain vitamin A 5000IU, vitamin C 300mg, vitamin D 1600IU per two capsules, etc., and the rest of the vitamins and minerals also exceed the recommended value, but do not exceed the maximum intake. GNC recommends taking two capsules a day, but most people take one capsule is enough to supplement their vitamins and can be taken according to their actual situation.
 
Some people may have gastrointestinal discomfort after taking multivitamin tablets, which may be caused by the calcium carbonate in the vitamin tablets, and people with less gastric acid secretion will have difficulty absorbing calcium carbonate, while Jian'anxi multivitamin uses a certain amount of calcium ascorbate, which is not easy to cause discomfort.
 
Like brands such as Nature's Treasure and Swisse, GNC also adds plant extracts to some of its vitamin products. In addition, GNC also has differentiated products such as women's vitality, men's prostate comprehensive care, and men's hair growth vitamins, which are added with amino acids, antioxidants, yohimbine extract (claimed to improve sexual function) and other substances, but such "efficacy" ingredients are often marketing points of merchants and can be regarded as ordinary vitamin products.