Amino Acids
Amino acids are cheap, well-tolerated building blocks, and a few have solid trial support for a specific, narrow use — glycine and sleep onset is a good example. Others are marketed on broader claims than the evidence currently supports. As with the rest of the site, the grade on each product is doing the real work here, not the ingredient's general reputation.
3 products · sorted by evidence grade
When the evidence changes, we’ll tell you.
One short email a month. New A-grades, downgraded claims, and reader questions.
Medical disclaimer. The information on this site is provided for educational purposes only and is not intended as medical advice. It does not constitute a diagnosis, treatment plan, or recommendation for any specific health condition. Always consult a qualified healthcare professional before making changes to your supplement regimen, diet, or lifestyle — especially if you are pregnant, nursing, taking medications, or managing a medical condition.
Affiliate disclosure. Some links on this site are affiliate links. If you purchase through them, we may earn a small commission at no extra cost to you. This never influences our editorial assessments — products are graded solely on the evidence.