How Much Magnesium Should You Take After 60?

The number on the front of the bottle is usually not the number that matters. Here's how much you need, and how to read the label.

By the Gold Seal Nutrition Team
Updated October 12, 2026

✓ Checked against 6 human trials on PubMed

Magnesium needs stay high after 60, while the amount most people get from food drops.

Short answer

Women over 50 need 320 mg a day; men over 50 need 420 mg, from food and supplements combined
The upper limit from supplements is 350 mg a day unless your doctor advises more
Read the elemental magnesium on the label, not the compound weight
Sleep and memory trials used about 145 to 500 mg of elemental magnesium a day

Daily needs after 50

Who	Daily need (food + supplements)	Supplement upper limit
Women 51+	320 mg	350 mg
Men 51+	420 mg	350 mg

The upper limit applies to magnesium from supplements and medicines, not from food. Many adults fall short on food alone.

Elemental vs compound: the label trap

Magnesium is always bound to something else. The label may show the weight of the whole compound, which is much bigger than the magnesium inside.

On the label	Actual magnesium
2,000 mg magnesium L-threonate	about 144 mg
500 mg magnesium glycinate	often 50 to 70 mg
Magnesium Complete, 4 forms (2,950 mg of compounds)	298 mg

What the studies used

In older adults with insomnia, 500 mg of magnesium a day for 8 weeks improved sleep.⁴ The threonate trials used 1,000 to 2,000 mg of magnesium L-threonate a day.¹ ² ⁶ Magnesium Complete gives 2,000 mg of threonate within 298 mg of total magnesium, under the 350 mg supplement limit.

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Talk to your doctor first if you: take heart rhythm, blood pressure or blood-thinning medicine, take antibiotics or osteoporosis drugs, have kidney disease, or are pregnant or nursing.

Frequently asked questions

How much magnesium should a 60-year-old take?

Adults over 50 need 320 mg (women) to 420 mg (men) of magnesium a day from food and supplements combined. Supplements are usually 150 to 400 mg of elemental magnesium a day. The upper limit for magnesium from supplements is 350 mg a day unless your doctor advises more.

Is 300 mg of magnesium a day too much for a senior?

For most healthy adults it is within the normal range. The supplement upper limit is 350 mg a day. People with kidney disease should only take magnesium with a doctor's guidance.

What is elemental magnesium?

It is the actual magnesium in a supplement, not the weight of the whole compound. 2,000 mg of magnesium L-threonate provides about 144 mg of elemental magnesium.

When should seniors take magnesium?

Any time, as long as it is every day. Many people take it with dinner or in the evening for sleep.

How we researched this. This guide was written by the Gold Seal Nutrition Team. We used AI research tools to pull and read the randomized human trials on magnesium L-threonate, magnesium bisglycinate and magnesium in older adults that are indexed on PubMed. Then we checked every number against the original paper. Each claim links to its source below. We make Magnesium Complete, so we earn money when you buy it, and we tell you that up front.

Sources

Hausenblas HA, et al. Magnesium-L-threonate improves sleep quality and daytime functioning in adults with self-reported sleep problems: a randomized controlled trial. Sleep Med X. 2024;8:100121. Source
Liu G, et al. Efficacy and safety of MMFS-01, a synapse density enhancer, for treating cognitive impairment in older adults: a randomized, double-blind, placebo-controlled trial. J Alzheimers Dis. 2016;49(4):971-990. Source
Schuster J, et al. Magnesium bisglycinate supplementation in healthy adults reporting poor sleep: a randomized, placebo-controlled trial. Nat Sci Sleep. 2025;17:2027-2040. Source
Abbasi B, et al. The effect of magnesium supplementation on primary insomnia in elderly: a double-blind placebo-controlled clinical trial. J Res Med Sci. 2012;17(12):1161-1169. Source
Zhang C, et al. Randomized, double-blind, placebo-controlled trial of a magnesium L-threonate-based formula on memory in healthy adults. Nutrients. 2022;14(24):5235. Source
Lopresti AL, Smith SJ. Randomised, double-blind, placebo-controlled trial of magnesium L-threonate on cognitive performance and sleep quality in adults. Front Nutr. 2026;12:1729164. (Adults aged 18 to 45, 2 g a day for 6 weeks.) Source
NIH Office of Dietary Supplements. Dietary Supplement Label Database: NOW Magnesium Caps 400 mg, Nature Made Magnesium Glycinate 200 mg, Doctor's Best High Absorption Magnesium, Pure Encapsulations Magnesium (Glycinate). Source
NIH Office of Dietary Supplements. Magnesium: fact sheet for health professionals (RDA and tolerable upper intake level). Source