Is there any standard for choosing calcium supplement products? Is the calcium supplement effect of California Institute of Technology good?

Is the calcium supplement effect of Calch good? Calch recommended five "gold standards" of calcium: "gold standard" 1: calcium products with high elemental calcium content should be selected as far as possible. "Gold Standard" 2: Appropriate amount of vitamin D is helpful for intestinal absorption and utilization of calcium, promoting the deposition of calcium ions and reducing the discharge of calcium ions. "Gold Standard" III: Safe and reliable, and widely applicable to people. The first choice is pure calcium carbonate, which contains no sugar, sodium, fat and cholesterol, and is suitable for a wide range of people. "Gold Standard" IV: Calcium carbonate, which has been verified by many clinical trials, is used in clinical research for the first time and has a definite and remarkable curative effect. It is the most frequently introduced oral calcium agent in the drug information of the United States Pharmacopoeia. "Gold Standard" 5: Easy to take and cost-effective. The higher the elemental calcium content of calcium tablets, the fewer tablets you take every day, which is relatively more economical and convenient. American Wyeth calcium carbonate D3 tablets. Each tablet contains 600 mg of high-concentration calcium, and vitamin D is added to promote the absorption and utilization of calcium. It is pure and reliable, and one tablet a day can meet the calcium demand of one day. It is an ideal choice for long-term calcium supplementation. Calch is available in all major physical pharmacies. However, compared with physical online stores, online pharmacies do not need to pay rent, utilities, manpower and other complicated expenses. And the price of online pharmacies is relatively favorable. Although online pharmacies seem to be in a good situation, in fact, selling drugs online was once chaotic. Therefore, choosing an online pharmacy needs to choose a guaranteed enterprise, such as Kang Aiduo drugstore. Kang 'aiduo Pharmacy is a first-class pharmacy network approved by the State Administration of Pharmaceutical Products. It serves the general public in the spirit of establishing credibility, quality first, customer first and sincere service, and is the first choice for users all over the country to buy genuine drugs online.