Totaria Magnesium Complex 700mg 12 in 1 Magnesium Supplement…
TotariaAmazon.com
$0.16/serving
$18.99+10°
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Magnesium
mineral · 180 active deals
How much does Magnesium cost?
The best-value Magnesium right now is about $0.03 per dose — across the 109 we can price per dose the median is $0.183/dose, so shopping on cost-per-dose can cut your cost several-fold. Every Magnesium deal here is ranked by cost per dose — what you actually pay per serving, not the sticker price — because forms and absorption differ, so the cheapest bottle isn’t always the cheapest dose.
Prices checked · live from the Amazon US catalog.
Right now the best value across our full Magnesium catalog is at $0.03 per serving.
Median $0.183/servingCheapest quartile under $0.087across 109 tracked Magnesium deals
Recommended daily intake
Daily Value 420 mgUpper limit 350 mg
The 350 mg upper limit applies to magnesium from SUPPLEMENTS only, not food; exceeding it commonly causes loose stools. General FDA/NIH adult guidance — not medical advice.
What Magnesium does
Magnesium is an abundant mineral that acts as a cofactor in more than 300 enzyme systems regulating diverse biochemical reactions, including protein synthesis, muscle and nerve function, blood glucose control, and blood pressure regulation; it is also required for energy production, contributes to the structural development of bone, and is needed for the synthesis of DNA, RNA, and the antioxidant glutathione. It also plays a role in moving calcium and potassium ions across cell membranes, a process important for nerve impulse conduction, muscle contraction, and normal heart rhythm. It has been studied in relation to hypertension and cardiovascular disease, type 2 diabetes, osteoporosis, and migraine headaches; for example, clinical trials suggest magnesium supplementation only marginally lowers blood pressure, observational studies link higher intakes with lower diabetes risk while clinical trial results are conflicting, and the American Academy of Neurology and American Headache Society have concluded magnesium therapy is probably effective for migraine prevention, though for most of these conditions NIH notes the evidence is limited, inconsistent, or that more research is needed. — per the NIH Office of Dietary Supplements; not medical advice.
Forms & absorption
Magnesium supplements are available in a variety of forms, including magnesium oxide, citrate, and chloride, and the Supplement Facts label declares the amount of elemental magnesium rather than the weight of the whole compound. The absorption of these forms varies, with forms that dissolve well in liquid being more completely absorbed in the gut than less soluble forms. The fact sheet notes that small studies have found the aspartate, citrate, lactate, and chloride forms are absorbed more completely and are more bioavailable than magnesium oxide and magnesium sulfate.
Elemental magnesium by form — read the label
A supplement's front-label figure is usually the compound weight, not elemental magnesium. By weight, magnesium oxide is about 60% elemental while orotate is only about 7% — so a “1,000 mg orotate” capsule delivers roughly 70 mg of elemental magnesium. Always compare the “Magnesium” line in the Supplement Facts panel, not the number on the front of the bottle.
| magnesium form |
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When and how to take Magnesium
Magnesium can be taken any time of day, with or without food. Many people take it in the evening because it can feel calming and supports sleep. If you take a large dose, splitting it across the day is gentler on the stomach.
Can you take Magnesium with other supplements?
Space magnesium a couple of hours apart from iron and zinc, and from some antibiotics and thyroid medication, since it can reduce their absorption. It stacks fine with vitamin D and calcium.
Magnesium side effects
The most common effect is loose stools, especially with oxide or citrate at higher doses. Glycinate is the gentlest form if that is a problem.
General guidance on timing and absorption, not medical advice. Check with a clinician about your medications and conditions.
L-theanine 200mg per serving with Magnesium Glycinate
Micro IngredientsAmazon.com
$0.06/serving
$24.990°
NATURE TARGET Ashwagandha Supplement 1000mg with Magnesium
NATURE TARGETAmazon.com
$0.13/serving
$15.990°
Magtein® Magnesium L-Threonate Liquid – 2000mg for Brain…
Epoch Nutrition SciencesAmazon.com
$1.37/serving
$40.970°
Liposomal Strontium Citrate 680mg Supplement – High Absorption…
CalyverithionAmazon.com
$0.25/serving
$44.990°
Magnesium Glycinate 400mg 240 Capsules for Good Sleep & Muscle…
Sandhu'sAmazon.com
$0.19/serving
$44.990°
Magnesium L-Threonate Plant-Based 3 in 1 Powered by Magbrain®…
KAPPA NUTRITIONAmazon.com
$0.26/serving
$22.990°
Liposomal Strontium Citrate 680mg Supplement – High Absorption…
CalyverithionAmazon.com
$0.35/serving
$20.990°
Magnesium Glycinate 400 MG per Serving 100% Chelated for High…
AllcoovitaAmazon.com
$0.14/serving
$12.990°
BulkSupplements.com Magnesium Glycinate Capsules - Magnesium…
BulkSupplements.comAmazon.com
$0.33/serving
$19.960°
Magnesium Glycinate 400 MG per Serving 100% Chelated for High…
AllcoovitaAmazon.com
$0.11/serving
$19.990°
Liposomal Strontium Citrate 680mg Supplement – High Absorption…
CalyverithionAmazon.com
$0.27/serving
$32.990°
Magnesium Glycinate 400mg | 200 Tablets – High Absorption…
NATURE'S BRANCHAmazon.com
$0.10/serving
$19.950°
Nature’s Bounty High Absorption Magnesium Glycinate 240 mg…
Nature's BountyAmazon.com
$0.13/serving
$15.970°
Magnesium Glycinate 400mg per Serving – High Absorption…
Simpli SupplementsAmazon.com
$0.06/serving
$9.970°
Magnesium Glycinate 400mg per Capsule – 240 Capsules – High…
I LOVE HEALTHAmazon.com
$0.07/serving
$15.990°
Magnesium L-Threonate Plant-Based 3 in 1 Powered by Magbrain®…
KAPPA NUTRITIONAmazon.com
$0.17/serving
$9.990°
Pure Original Ingredients D-Ribose (365 Capsules) No Magnesium…
PURE ORIGINAL INGREDIENTSAmazon.com
$0.06/serving
$22.990°
PURE ORIGINAL INGREDIENTS Cayenne Pepper (730 Capsules) No…
PURE ORIGINAL INGREDIENTSAmazon.com
$0.05/serving
$37.290°
Tart Cherry+ with Magnesium Glycinate & 95% Turmeric Curcumin
Micro IngredientsAmazon.com
$0.06/serving
$17.370°
Clean Nutraceuticals Melatonin 10mg Valerian Root L Theanine…
Clean NutraceuticalsAmazon.com
$0.42/serving
$24.950°
Electrolytes Supplement - 6-in-1 Advanced Hydration Complex…
Nature's PeakAmazon.com
$0.11/serving
$6.820°
Electrolytes Powder, 1lb (69 Servings) – No Sugar, Lemon Lime…
DEAL SUPPLEMENTAmazon.com
$0.35/serving
$23.990°
BulkSupplements.com Magnesium Taurate Capsules - Magnesium…
BulkSupplements.comAmazon.com
$0.18/serving
$21.960°
Magnesium Taurate 400MG Elemental Magnesium Per Serving…
Purely HolisticAmazon.com
$0.14/serving
$32.970°
Cardiovascular Research Ecological Formulas Magnesium Taurate…
Ecological FormulasAmazon.com
$0.18/serving
$31.990°
NatureBell Magnesium Taurate - 240 Capsules - 1,500mg High…
NatureBellAmazon.com
$0.08/serving
$19.990°
Magnesium L-Threonate Plant-Based 3 in 1 Powered by Magbrain®…
KAPPA NUTRITIONAmazon.com
$0.21/serving
$31.990°
Nature Made Magnesium L-Threonate with Vitamin C & Vitamin D3…
Nature MadeAmazon.com
$0.41/serving
$36.990°
Kappa Nutrition Powered by Magbrain™ Magnesium L-Threonate…
KAPPA NUTRITIONAmazon.com
$6.66/serving
$19.990°
Sports Research® Magnesium Oxide 420mg w/Coconut MCT Oil
Sports ResearchAmazon.com
$0.19/serving
$16.950°
Carlyle Magnesium Oxide 500mg | 120 Capsules | Premium Quality…
CarlyleAmazon.com
$0.08/serving
$9.990°
Magnesium Oxide 400mg, 500 Capsules | Elemental Form for Max…
Micro IngredientsAmazon.com
$0.03/serving
$15.190°
Magnesium Oxide 400mg, 400 Capsules | High Purity Elemental…
NatureBellAmazon.com
$0.04/serving
$14.950°
![Magnesium 400mg [High Potency] Supplement – Magnesium Oxide…](/_next/image?url=https%3A%2F%2Fm.media-amazon.com%2Fimages%2FI%2F41A9%2BSJ9rLL._SL500_.jpg&w=3840&q=75)
Magnesium 400mg [High Potency] Supplement – Magnesium Oxide…
P Puregen LabsAmazon.com
$0.07/serving
$8.950°
Life Extension Magnesium Citrate 100 mg Vegetarian Capsules
Life ExtensionAmazon.com
$0.10/serving
$9.500°
Vitamatic Magnesium Citrate 500mg per Serving - 180 Vegetarian…
VitamaticAmazon.com
$0.06/serving
$9.990°
SOLARAY Magnesium Citrate 400mg - Magnesium Supplement - Bone…
SolarayAmazon.com
$0.35/serving
$20.890°
Magnesium Citrate 1000mg Per Serving - Max Absorption…
Health Nutrition NaturalsAmazon.com
$0.06/serving
$15.020°
Asc2P 500mg - SuperSmart | Advanced Vitamin C - Magnesium…
SuperSmart USA LLCSuperSmart
$0.34/serving
$20.400°
Magnesium Orotate 1500mg - SuperSmart | High Absorption…
SuperSmart USA LLCSuperSmart
$0.28/serving
$25.000°
BioActive Vitamin B6 25mg Capsules - Active P-5-P Form…
Triquetra HealthAmazon.com
$0.32/serving
$18.990°
Methylated Vitamin B Complex Gummies: 22-in-1 for Daily Energy…
BSSTABBONAmazon.com
$1.59/serving
$34.990°
BioActive Vitamin B6 100mg Capsules - Active P-5-P Form…
Triquetra HealthAmazon.com
$0.37/serving
$21.990°
Vitamin D3 K2 + Calcium Liquid-filled Gummies for Kids & Teens
LILICAREAmazon.com
$0.44/serving
$26.490°
5-in-1 Vitamin D3 K2 Drops - Vitamin D3 10000 IU & K2(MK-7)…
Venture PalAmazon.com
$0.28/serving
$16.890°
Alafia Naturals The Migraine Gummy - World's First Comfort…
Alafia NaturalsAmazon.com
$0.36/serving
$21.490°
BulkSupplements.com Magnesium Malate Capsules - Magnesium…
BulkSupplements.comAmazon.com
$0.33/serving
$19.960°
Magnesium Malate Capsules (420 Count) - 1,500mg Per Serving…
Double Wood SupplementsAmazon.com
$0.06/serving
$24.950°
Vitamin D3 K2 - Vitamin D3 10000 iu & K2 as MK-7 120 mcg…
NUTRAHARMONYAmazon.com
$0.18/serving
$21.490°
240 Count - Coral Calcium 1500mg Capsules - Bone Health…
Barefoot Coral Calcium CompleteAmazon.com
$0.17/serving
$39.990°
Magnesium Citrate Powder Capsules 400mg - 180 Count Veg Caps…
PhiNaturalsAmazon.com
$0.08/serving
$14.990°
Magnesium Citrate Capsules 1000mg | High Absorption Supplement…
NUTRAHARMONYAmazon.com
$0.17/serving
$19.890°
Country Life Magnesium Citrate 250mg - 120 Tablets - Supports…
Country LifeAmazon.com
$0.19/serving
$22.790°
Zinc 30mg with Copper, Selenium & Vitamin D3 | 120 Capsules…
SANDHUHERBALSAmazon.com
$0.21/serving
$24.990°
Natural Flow Magnesium Glycinate Complex — 200mg Elemental Mg…
Natural Flow SupplementsAmazon.com
$0.22/serving
$26.950°
Magnesium Complex 420mg with Vitamin D3 K2 - Four Bioavailable…
Local NutritionAmazon.com
$0.40/serving
$36.000°
Luma Nutrition Magnesium Glycinate 1000mg - Support Stress
Luma NutritionAmazon.com
$0.33/serving
$19.990°
VITBOOST Magnesium Glycinate 500mg - High Absorption Chelated…
VITBOOSTAmazon.com
$0.08/serving
$9.950°
Vital Nutrients Triple Magnesium Complex Supplement | Vegan…
Vital NutrientsAmazon.com
$0.30/serving
$26.990°
Nature Made Extra Strength Dosage Magnesium Citrate Tablets
Nature MadeAmazon.com
$0.22/serving
$13.490°
Allergy Research Group Magnesium Citrate - Supports Energy…
Allergy Research GroupAmazon.com
$0.21/serving
$18.990°
Jarrow Formulas Magnesium Glycinate Veggie Capsules - 360 mg…
Jarrow FormulasAmazon.com
$0.20/serving
$17.990°
Nature Made High Absorption Magnesium Glycinate Gummies 100 mg…
Nature MadeAmazon.com
$0.39/serving
$15.790°
Magnesium Citrate Complex 500 MG for Constipation & Digestion…
Nobi NutritionAmazon.com
$0.66/serving
$19.950°
Natural Vitality Calm Magnesium Gummies | 330mg Per Serving…
Natural VitalityAmazon.com
$0.14/serving
$32.990°
Every Magnesium deal above is ranked by real cost per dose with no paid placement — see our and .
Independent testing
3 of 106 tracked Magnesium brands here are flagged as carrying independent third-party testing — a voluntary check of a product's identity, potency and contaminants by an outside lab. It's a quality signal, not a value or efficacy claim. Confirm any brand's current status on the official registries:
Testing status is self-reported by the brand or drawn from public certification and may change — always verify on the official registry before purchase.
Magnesium — dosage, safety & deals FAQ
- How much Magnesium do you need per day?
RDAs depend on age and sex. Adult men need 400-420 mg; adult women need 310-320 mg. Pregnancy is 350-400 mg and lactation 310-360 mg. Children range from 80 mg (1-3 years) to 240 mg (9-13 years); infants have AIs of 30-75 mg. — per the NIH Office of Dietary Supplements; general information, not medical advice.
- Can you take too much Magnesium?
Yes. The for supplemental magnesium is 350 mg for adults. High supplement or medication doses can cause diarrhea, nausea, and abdominal cramping. Very high doses cause toxicity: hypotension, vomiting, difficulty breathing, irregular heartbeat, and cardiac arrest; fatal hypermagnesemia has occurred. — per the NIH Office of Dietary Supplements; general information, not medical advice.
- What are the signs of Magnesium deficiency?
Early signs include loss of appetite, nausea, vomiting, fatigue, and weakness. As it worsens: numbness, tingling, muscle contractions and cramps, seizures, personality changes, abnormal heart rhythms, and coronary spasms. Severe deficiency can cause hypocalcemia (low calcium) or hypokalemia (low potassium). — per the NIH Office of Dietary Supplements; general information, not medical advice.
- Who is most likely to need more Magnesium?
Groups at risk of inadequacy include people with gastrointestinal diseases (Crohn's, celiac, regional enteritis), people with type 2 diabetes, people with alcohol dependence, and older adults, who have lower intakes, reduced gut absorption, and increased renal excretion. — per the NIH Office of Dietary Supplements; general information, not medical advice.
Magnesium guides
Related minerals
References & sources
- Magnesium: Fact Sheet for Health Professionals — NIH Office of Dietary Supplements
- USP Verified product participants — U.S. Pharmacopeia
- NSF certified products — NSF
We link primary sources and paraphrase their findings — never copy their text, tables, or images. Cost-per-dose figures are our own first-party catalog data.