Sleep · Melatonin

Melatonin (supplement class)

A hormone involved in the sleep–wake cycle, sold in the US as a dietary supplement. Huge shelf presence — gummies, tablets, blends — with wide variation in dose and product quality.

Guideline honesty: AASM’s 2017 pharmacologic CPG for chronic insomnia includes a weak recommendation against clinicians using melatonin for that condition. This aisle lists the class because shoppers see it everywhere — not because guidelines endorse it for chronic insomnia. For ongoing sleep problems, ask a clinician; CBT-I is first-line behavioral care in sleep medicine guidance.

What to know on the shelf

  • Not an FDA-approved drug for treating insomnia — Supplement Facts, not Drug Facts
  • Dose and content can vary — studies have found labeled amounts that don’t match what’s measured in some bottles
  • Often mixed with herbs (valerian, passionflower, etc.) — more ingredients ≠ clearer evidence
  • “PM” brand lines sometimes sell both diphenhydramine drugs and melatonin supplements under similar branding — read the panel

Who should check first

  • Pregnancy, nursing, or children
  • Autoimmune conditions, seizure history, or complex medication lists
  • Anyone with suspected sleep apnea, restless legs, or mood crisis — get clinical evaluation

Example product on Amazon

Regular Amazon.com link for preview only — not affiliate (no tag=). One popular bottle for orientation; not a “best melatonin” pick.

Natrol Melatonin 5 mg (supplement) on Amazon

Sources for the caution

  1. AASM 2017 pharmacologic CPG for chronic insomnia (weak recommendation against melatonin for chronic insomnia)
  2. AASM pharmacologic insomnia CPG PDF
  3. CBT-I / combination therapy context

Pharmacy textbooks & tertiary references

  • Handbook of Nonprescription Drugs (APhA)
  • The Practitioner’s Quick Reference to Nonprescription Drugs
  • Nonprescription Product Therapeutics
  • Facts and Comparisons
  • Drug Information Handbook (Lexi-Comp)
  • Micromedex
  • Clinical Pharmacology
  • Pharmacist’s Letter
  • APhA DrugInfoLine

Sources explain why we caution. Aisle picks ≠ treatment recommendations. Aisle copy is oriented to these standard pharmacist nonprescription references plus public guidelines and Drug Facts labels. This site is educational aisle orientation, not a substitute for those full references or clinical care.

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