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Melatonin

A hormone that signals biological night and is used most plausibly for circadian-timing problems rather than as a universal sedative.

By WellnessAIDaily Editorial TeamPublished August 31, 2026Updated August 31, 2026Not medically reviewed
Contents

What it is

Alternative names and label synonyms: sleep hormone, N-acetyl-5-methoxytryptamine

Melatonin is a hormone produced by the pineal gland in response to darkness. Supplements provide synthetic or, less commonly, animal-derived melatonin.

Where it comes from

Source and manufacturing method vary by product. This has not been independently verified for every finished product containing Melatonin.

Food sources

Melatonin occurs in small amounts in some foods, but ordinary food intake is not equivalent to a supplement dose.

Why people use it

Melatonin may help with jet lag, delayed sleep-wake timing, and selected sleep problems. Effects on general chronic insomnia are often modest and timing-sensitive.

Potential benefits and outcome-specific evidence

Ratings apply only to the stated outcome. They are not a grade for the ingredient or proof that a finished product works.

The specific uses described in this profile

Melatonin may help with jet lag, delayed sleep-wake timing, and selected sleep problems. Effects on general chronic insomnia are often modest and timing-sensitive.

What current research says

Evidence differs by condition, age, formulation, dose, and timing. Product-label accuracy can vary, so trial results do not guarantee the content of every supplement.

Traditional useHistorical use can generate research questions but does not prove effectiveness.
MechanismA plausible biological mechanism is not the same as a demonstrated clinical result.
Clinical evidencePopulation, form, amount, duration and measured outcome must match the claim.
Finished productIngredient evidence does not establish that a multi-ingredient commercial product provides the same result.

Common forms and differences

Common forms

Immediate-release and extended-release tablets, capsules, liquids, gummies, and sublingual products are common.

How forms may differ

Immediate-release and extended-release tablets, capsules, liquids, gummies, and sublingual products are common.

Amounts commonly used in research

Amounts used in research vary by outcome, form, population, and study design. A reliable single research amount was not available and no personalized dose is provided.

Important dosage context

Timing may matter as much as amount. Review sleep schedule, light exposure, caffeine, medicines, and the reason for poor sleep before choosing a product.

Safety and possible side effects

Short-term effects can include sleepiness, headache, dizziness, nausea, and vivid dreams. Long-term safety is less certain for many populations.

Pregnancy and breastfeeding

Pregnancy and breastfeeding safety has not been independently verified for this ingredient and product form. Use only with qualified professional guidance.

Children and older adults

Children and older adults may have different needs, tolerances, kidney or liver function, and medication risks. Adult marketing directions should not be applied to children.

Potential interactions

Medication interactions

Possible concerns include anticoagulants, anticonvulsants, diabetes and blood-pressure medicines, sedatives, and immunosuppressants.

Supplement interactions

Combining supplements can duplicate ingredients, increase total exposure, or create interactions. Check every label and avoid assuming that separate products are safe together.

Who should be cautious

Pregnancy, breastfeeding, children, seizure disorders, autoimmune conditions, or persistent insomnia warrant professional guidance.

Product-quality considerations

Quality checks

Prefer a complete label with identity, exact amount, serving, other ingredients, allergen information, lot number, expiry, manufacturer contact, and storage instructions.

Third-party testing

Third-party certification must be verified with the certifier or product record. A badge or seller statement alone is not proof that every lot was tested for identity, potency, contaminants, or banned substances.

How to read the product label

Look for “Melatonin” and its synonyms (sleep hormone, N-acetyl-5-methoxytryptamine), the exact form, amount per serving, serving size, proprietary blends, warnings, and certification details.

Products containing Melatonin

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Pineal Guardian X liquid supplement bottle
Reviewed product

Pineal Guardian X

Brand
Not independently verified
Ingredient form
Lion's mane, spirulina, moringa, tamarind, pine bark, chlorella, neem, ginkgo and bacopa
Amount per serving
Not independently verified
Serving size
Not independently verified
Third-party certification
Not independently verified
Price
1 bottle: $69; 3 bottles: $177; 6 bottles: $234
Read reviewRetailer link

Best products containing Melatonin

Product recommendations are being researched. No ranking is currently available.

Review the comparison methodology

Frequently asked questions

References

  1. NCCIH — Melatonin: What You Need to Know
  2. NIH ODS — Dietary Supplements: What You Need to Know

Author and review information

Author: WellnessAIDaily Editorial Team

Medical review: Not medically reviewed. A medical reviewer is never implied unless a qualified person has actually reviewed the page and their credentials are verified.

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