A "booster supplement" refers to a product or substance that is used to enhance or increase something. It is like a helper or an extra support that improves the effectiveness or strength of something. Full definition
In fact, some of the most popular testosterone booster supplements on the market have been shown not to boost testosterone levels in your body. (toptestosteroneboosters.org)
Its innovative formula adds a combination of several ingredients not commonly found in other testosterone booster supplements. (benefitsoffenugreek.com)