All vitamin supplements available in the market are not the same in terms of quality. Three basic types are available: tablets, capsules, and liquid form. Tablets are the most common, formed by mixing organic or inorganic binders and compressed into tablet form. They have poor absorption rate, often less than 30%. The absorption also depends on the quality of binders used. High-quality vitamin supplements use expensive organic binders, which makes their nutrients get absorbed in the upper intestinal walls straight into the blood stream.

Liquid vitamin supplements, claimed to have high-absorption rates, are available in a wide range of flavors. However, the claim that these are capable of effecting an almost 90% absorption must be regarded cautiously. They cannot be assumed to be better than tablets, since faster absorption is not the key issue, but better assimilation and optimum utilization of the nutrient for the body