Can You Take Magnesium and Melatonin Together?
Quick Answer: Yes. There's no known interaction between magnesium and melatonin, and many people take them together as part of a bedtime routine. They do different jobs: melatonin is the hormone your body uses to signal "it's night," while magnesium is a mineral your body uses in more than 300 enzyme reactions, including ones that help your muscles and nervous system relax. Take melatonin 30 to 60 minutes before bed, starting with the lowest dose that works. Take magnesium with dinner or in the evening. Adults should keep supplemental magnesium under 350 mg a day unless a doctor advises otherwise.
What each one actually does
Melatonin is a hormone your brain makes as it gets dark. It doesn't knock you out like a sleeping pill. It tells your body it's time to wind down. That's why it's most often used for shifting your sleep timing, like jet lag or a schedule that's drifted late. Bright screens in the evening can delay your body's own melatonin signal, which is one reason a phone in bed makes it harder to switch off.
Magnesium is a mineral, not a hormone. Your body uses it for muscle and nerve function, energy production and hundreds of other processes. Nearly half of Americans get less magnesium from food than they need, according to the NIH Office of Dietary Supplements. Many people take it in the evening because they find it relaxing.
Because they work in completely different ways, taking both doesn't double up on anything.
How to take them together
Melatonin: 30 to 60 minutes before bed. Start low. Many people do well on 1 to 3 mg, and more isn't always better: higher doses are more likely to leave you groggy the next morning.
Magnesium: with dinner or in the evening. Taking it with food is easier on the stomach. If you take a larger dose, splitting it between lunch and dinner helps.
One time, if that's easier. Taking both with your evening routine is fine. The best routine is the one you'll actually stick to.
For more on how the two compare, read Melatonin vs. Magnesium for Sleep: Which Should You Take First?
Read the label on combo gummies
Melatonin and magnesium gummies are popular, and they're an easy way to take melatonin. But check the magnesium line on the Supplement Facts panel.
Magnesium is bulky, so a small gummy can only hold a little of it. Many combo gummies contain just a few milligrams of magnesium, under 1% of the daily value, next to a full dose of melatonin. That's fine if you want melatonin with a touch of magnesium. If you're looking for meaningful magnesium, you'll need a separate magnesium supplement.
Which magnesium is best at night?
Magnesium glycinate is a popular choice for evenings. It's well absorbed and gentle on the stomach, while magnesium citrate can have a laxative effect for some people and magnesium oxide is absorbed less well. When comparing bottles, look at the Supplement Facts panel: it lists the amount of magnesium itself, not the weight of the whole compound. Our guide to magnesium glycinate vs other forms goes deeper.
Doses at a glance
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| Typical use | Upper limit | |
|---|---|---|
| Melatonin | 0.5–5 mg, 30–60 min before bed | No official limit; use the lowest dose that works |
| Magnesium | 310–420 mg/day needed from all sources | 350 mg/day from supplements |
The magnesium upper limit counts supplements only, not the magnesium in your food. Above it, the most common side effect is loose stools.
Who should check with a doctor first
Talk to your doctor or pharmacist before taking melatonin if you're pregnant or breastfeeding, if it's for a child, or if you take prescription medicine, especially blood thinners, blood pressure medicine or anything else for sleep. Magnesium can reduce how well some antibiotics and osteoporosis medicines absorb, and it builds up in people with reduced kidney function. Melatonin can make you drowsy, so don't drive after taking it.
If trouble sleeping lasts more than a few weeks, see your doctor rather than adding more supplements.
Frequently Asked Questions
Q: Is it safe to take magnesium and melatonin every night?
A: Magnesium is a nutrient you need every day. Melatonin is generally considered safe for short-term use; if you find you need it every night for weeks, check in with your doctor.
Q: Should I take them at the same time?
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Subscribe & Save 10%A: You can. Melatonin works best 30 to 60 minutes before bed, so taking both then is simple.
Q: Can magnesium replace melatonin?
A: They do different things. Magnesium supports relaxation; melatonin signals your body's sleep timing. Some people find one is enough, and some prefer both.
Q: Will melatonin make me groggy in the morning?
A: It can at higher doses. If it does, try a lower dose or take it a little earlier in the evening.
Shop Magnesium and Melatonin at Moore Vitamins
For magnesium, our house-brand Windmill Magnesium Glycinate 200mg Capsules give you 200 mg of magnesium per 2-capsule serving, an easy one to take with dinner.
For melatonin, Windmill Melatonin 5mg Tablets support your body's natural sleep-wake cycle, and VitaDrops Melatonin & Magnesium Gummies give you 5 mg of melatonin in a strawberry gummy.
New to melatonin? Start with How Long Does Melatonin Take to Work?
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