How we review

This site and Vivacelle, one of the NAD+ supplements we cover, share an owner. When we link to other products, we may earn a commission if you buy. We publish the price, serving and label figures each product states, so you can check our numbers against the source.

Every figure on this site comes from the product page it describes. Price, servings, dose and label details are recorded exactly as each page states them.

From those stated numbers we work out the cost of a single serving. Anything a page leaves blank is marked as not stated, never estimated or filled in with a guess.

Every review is stamped with the day its numbers were checked, so any line can be verified against its product page.