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Medical disclaimer
This site reports what primary sources say. It does not tell you what to take, how much, or whether to take anything at all. Read this page before relying on anything published here.
Not medical advice
HealthspanLedger is an educational reference. Nothing on this site is medical advice, and nothing here substitutes for the judgment of a licensed clinician who knows your history, medications, and circumstances. Confirm every dose with a licensed clinician before acting on it.
The site never recommends a dose
Every number on this site is a report of what a source says: what an FDA label specifies, what a clinical trial studied, what the literature reports. The calculators perform arithmetic on values you enter; they do not suggest what those values should be. Where no human data exists, we say so instead of publishing a number. At no point does the site recommend any dose to any person.
Investigational and research compounds
Many compounds described on this site are investigational or sold as research chemicals. They are not FDA-approved for human use, their safety profiles are incompletely characterized, and describing them here is not an endorsement of any unapproved product. Regulatory status is stated on each compound guide where we have a source for it.
Adverse reactions
If you have a bad reaction to any substance, call emergency services immediately. In the United States you can also reach Poison Control at 1-800-222-1222. Report suspected adverse events involving FDA-regulated products to FDA MedWatch.