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🌙 Magnesium
Rugby Magnesium Oxide 400 mg Tablets - Dietary Supplement…
Cost per serving
$0.04
360 servings · ~360-day supply
Low absorption
$13.90Price from Amazon.com
Rugby · Amazon.com 0
See the offer Best Magnesium for sleep
Magnesium is the mineral most associated with sleep, and glycinate is the gentle, commonly-chosen form (oxide is cheaper but poorly absorbed and laxative). Below, the magnesium products people use ranked by real cost per dose (to the commonly-studied 300 mg dose). A value comparison, not medical advice.
Updated September 2026
What the evidence actually shows
The evidence is limited and mixed — small trials suggest a modest benefit for sleep quality, mainly in older adults or people who are low in magnesium. It is not a sedative.
Commonly used: ~200–350 mg elemental in the evening.
How this list is built: these are magnesium products ranked by real cost per dose across our whole magnesium catalogue — not filtered or re-ordered by sleep. We don’t hold per-product evidence for a specific use, so we don’t pretend to rank for one. Products whose own label says they are for something else are left out.
Background on magnesium from the NIH Office of Dietary Supplements .
For sleep, glycinate is the form usually chosen — see best glycinate by cost per dose.
Ranked by cost per dose
NEW
🥤 Electrolytes
Advanced Electrolyte Complex Capsules for Hydration
Cost per serving
$0.04
240 servings · ~240-day supply
High absorption
$9.90Price from Amazon.com
Micro Ingredients · Amazon.com 0
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🌙 Magnesium
Rugby Magnesium Oxide 400 mg Tablets - Dietary Supplement…
Cost per serving
$0.05
120 servings · ~120-day supply
Low absorption
$5.98Price from Amazon.com
Rugby · Amazon.com 0
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🍋 Lemon Balm
NatureBell Valerian Root for Sleep
Cost per serving
$0.05
300 servings · ~300-day supply
Well absorbed
$14.95Price from Amazon.com
NatureBell · Amazon.com 0
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🌙 Magnesium
Swanson Magnesium 200 Milligrams 250 Capsules
Cost per serving
$0.05
250 servings · ~250-day supply
$12.59Price from Amazon.com
Swanson · Amazon.com 0
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🌶️ Capsaicin (cayenne)
PURE ORIGINAL INGREDIENTS Cayenne Pepper (730 Capsules) No…
Cost per serving
$0.05
730 servings · ~730-day supply
$37.29Price from Amazon.com
PURE ORIGINAL INGREDIENTS · Amazon.com 0
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🦴 Calcium
Amazing Formulas Calcium Magnesium Zinc D3-300 Tablets Per…
Cost per serving
$0.05
300 servings · ~300-day supply
High absorption
$16.49Price from Amazon.com
Amazing Formulas · Amazon.com 0
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🌙 Magnesium
Magnesium Glycinate 400mg per Serving – High Absorption…
Cost per serving
$0.06
180 servings · ~180-day supply
Well absorbed
$9.97Price from Amazon.com
Simpli Supplements · Amazon.com 0
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🌙 Magnesium
Nutricost Potassium (99 mg) Magnesium (210 mg) Citrates
Cost per serving
$0.06
240 servings · ~240-day supply
$13.95Price from Amazon.com
Nutricost · Amazon.com 0
See the offer See the full ranking, benchmarks and lab-tested brands on best magnesium by cost per dose.
Frequently asked
Does magnesium help with sleep?+
The evidence is limited and mixed — small trials suggest a modest benefit for sleep quality, mainly in older adults or people who are low in magnesium. It is not a sedative. This page ranks the products people take by real cost per dose; it does not claim a supplement treats or cures anything. Not medical advice — talk to a clinician about sleep.
Which magnesium is cheapest for sleep?+
As of September 2026, the best value we track is Rugby Magnesium Oxide 400 mg Tablets - Dietary Supplement - Gluten-Free - 120 Count (3 Pack). The full ranking by cost per dose is above; for sleep, glycinate is the form usually chosen. Price ÷ servings ÷ dose — the number retailers rarely divide out.
How much magnesium for sleep?+
Commonly ~200–350 mg elemental in the evening. This is a general reference, not a prescription — confirm the right amount for you with a clinician. Not medical advice.