As is the case with food, the fewer additives in a supplement, the better, usually. Check the label to see what kind of binders, fillers, or preservatives the product has, steering clear of potentially harmful adds. While powdered, flavored supplements are the ones that tend to have more wonky ingredients, capsules and tinctures can too. If you see an ingredient on there you’re not familiar with, do a quick search online to see its purpose and any potential health risks.
When considering a new supplement, it’s also a good idea to look for ones that have gone through multiple rounds of testing and come from a facility that is third-party certified for its quality and testing standards.