Keep in mind that this IS an affiliate link, but I have been approached by multiple supplement companies and have turned them down because I didn't believe in their product. (mollygalbraith.com)
Specifically, people will often take multiple supplements that are «designed» to elicit muscle growth, assuming they will have additive effects. (sciencedrivennutrition.com)
There are multiple supplements available in the fitness market than you actually need. (mensquats.com)