FDA is warning people NOT to use supplements containing L-5-hydroxytryptophan (PhenCal, Thin-Thin, etc.)

June 1998

The FDA is warning people NOT to use supplements containingL-5-hydroxytryptophan (PhenCal, Thin-Thin, etc).

L-5-hydroxytryptophan is a metabolite of L-tryptophan.

These amino acids are used to increase serotonin production.People take them for weight loss...depression...anxiety, etc.

Get concise advice on drug therapy, plus unlimited access to CE

Pharmacist's Letter membership benefits include:

  • 12 issues every year — what you need to know and do, right now
  • Quick, practical reference charts and tools
  • Comprehensive CE library to meet license renewal and state requirements
  • Multiple course formats including live webinars, podcasts, and CE-in-the-Letter to match your learning style
  • Plus much more!

Choose the right tier for your needs today.

Already a subscriber? Log in

Volume pricing available. Get a quote