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Goal

Sleep & Relaxation

Ingredients researchers have studied in relation to sleep and relaxation, with what the evidence does — and doesn’t — show. Evidence here is generally limited; ongoing sleep problems are worth discussing with a clinician, since they can have medical causes.

Ingredients researchers have studied

MINERAL

Magnesium

An essential mineral sold in many salt forms — glycinate, citrate, oxide and more — with very different elemental amounts.

Studied for: Meeting magnesium needs · Occasional constipation (certain forms)
HORMONE

Melatonin

Melatonin is a hormone the brain produces in response to darkness that helps regulate sleep–wake timing. In the U.S. it’

Studied for: Jet lag and sleep timing
AMINO ACID

L-Theanine

L-theanine is an amino acid found naturally in tea leaves. It’s sold alone or combined with caffeine or magnesium. SuppS

Research in progress
HERBAL

Ashwagandha

Ashwagandha (Withania somnifera) is an herb used in Ayurvedic tradition. Supplements use root or root-and-leaf extracts,

Studied for: Stress and sleep

Comparisons

MAGNESIUM

Glycinate vs Citrate

Forms, label differences and what to compare before choosing.

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Products

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Guides

MAGNESIUM

How to Compare Magnesium Supplements

A five-step checklist: elemental amount, form, blends, other ingredients and cost per 100 mg.

This page is educational and is not medical advice. Talk to a healthcare professional before starting a supplement, especially if you have a medical condition, take medications, or are pregnant or breastfeeding.