Best Time to Take Magnesium Glycinate (and Any Magnesium)
Prices checked · 6 glycinate products priced · 5 registries searched
Take magnesium glycinate at the same time every day, with a meal or snack. No study shows that morning or night works better, so pick the time you will remember.
Many people take glycinate with dinner or in the evening. Taking it with food makes loose stools, the most common side effect, less likely. The same timing works for any form of magnesium. Follow the label for how much to take.
Lowest cost per 200 mg: BulkSupplements Magnesium Glycinate Powder, $0.12 per 200 mg of magnesium (300 mg in 3/4 tsp of powder, about 2.2 g); NSF/ANSI 173
Check price →As an Amazon Associate we earn from qualifying purchases. Ranked by cost per 200 mg of magnesium, never commissions. Not medical advice; talk to a clinician before starting a supplement.
Magnesium glycinate we price, cheapest per 200 mg first
| Product | Magnesium per serving | Serving | Per 200 mg magnesium (checked Oct 9, 2026) | Registry check | |
|---|---|---|---|---|---|
| BulkSupplements Magnesium Glycinate Powder | 300 mg | 3/4 tsp of powder, about 2.2 g | $0.12 | NSF/ANSI 173 “MAGNESIUM GLYCINATE” listed | Check price → |
| Nature Made Magnesium Glycinate | 200 mg | 1 capsule | $0.20 | USP Verified “Nature Made High Absorption Magnesium Glycinate 200mg Capsules” listed | Check price → |
| Vitamin Shoppe Magnesium Glycinate | 400 mg | 3 tablets | $0.22 | None stated | Check price → |
| Doctor's Best High Absorption Magnesium | 200 mg | 2 tablets | $0.23 | None stated | Check price → |
| KAL Magnesium Glycinate | 350 mg | 4 VegCaps | $0.24 | None stated | Check price → |
| Thorne Magnesium Glycinate | 120 mg | 1 capsule | $0.48 | NSF/ANSI 173 “Thorne Magnesium Glycinate” listed | Check price → |
How we compute it: per 200 mg of magnesium = Amazon price ÷ (servings in the bottle × mg of magnesium per serving) × 200. Magnesium per serving is the elemental amount on the label, not the weight of the glycinate compound. Every glycinate we track is in the table; for each one, the pack and serving on the Amazon listing we link match the label figures used here. We searched NSF Certified for Sport (full list read October 1, 2026), NSF/ANSI 173 (list saved August 25, 2026), Informed Choice (list read September 22, 2026), Informed Sport and USP Verified. NSF lists each product by flavor and pack, so we count an NSF listing only when it covers the product we link.
Quick answer: There's no single "best time" to take magnesium. Follow the label and take it at the same time each day. Take it with food to avoid the most common side effect (loose stools), and keep it away from antibiotics, high-dose zinc, and large calcium doses. Taking it consistently matters more than the hour.
Timing by form
| Form | When | Note |
|---|---|---|
| Glycinate | With a meal; many people choose the evening | Well absorbed; often described as gentle on the stomach |
| Citrate | With a meal | Mild osmotic (laxative) effect; well absorbed |
| Oxide | With a meal | Poorly absorbed and laxative; mainly sold as an antacid or occasional laxative |
| Any form | Consistent daily time, with food | Total daily intake matters more than the hour |
Best time of day to take magnesium glycinate
With a meal or snack, at the same time each day. Many people take glycinate in the evening, but no trial shows one hour is better than another. How much magnesium studies have used is on the magnesium amounts in studies page.
Citrate
Magnesium citrate is well absorbed and has a mild osmotic pull, so some people prefer to take it earlier in the day (NIH ODS). Morning or evening both work — pick the time you'll actually remember. See our magnesium forms comparison.
With food or on an empty stomach?
With food. The most common magnesium side effect is loose stools and nausea, and taking it with a meal blunts that. Supplemental magnesium above the tolerable upper limit of 350 mg/day makes diarrhea especially likely, so if you're taking a higher total, splitting it across meals is gentler than one large dose (NIH ODS). Magnesium from food carries no such limit — only supplements and magnesium-containing medications do.
What to keep magnesium away from
Three spacing rules.
Antibiotics: take magnesium at least 2 hours before, or 4–6 hours after, tetracycline and quinolone antibiotics — magnesium binds them in the gut and blocks their absorption. High-dose zinc: very high supplemental zinc (around 142 mg/day in the study the NIH cites) can interfere with magnesium absorption; normal zinc doses are fine. Calcium: a large calcium dose taken at the same moment as magnesium may reduce how much magnesium you absorb, so it's reasonable to space big doses apart rather than take them together. Antibiotic and zinc figures: NIH ODS Magnesium fact sheet.
Frequently asked questions
What is the best time of day to take magnesium?
Follow the label. The single most important rule is consistency — take it at the same time each day, ideally with food. Some people take glycinate in the evening and citrate in the morning; no trial shows one hour is better than another.
Should I take magnesium in the morning or at night?
Either works. Pick the time you will remember and take it with food. Citrate has a laxative effect, so some people prefer to take it earlier in the day. Time of day matters far less than consistency.
Should magnesium be taken with or without food?
With food is usually better — it reduces the risk of diarrhea and nausea, the most common side effect. Supplemental magnesium above 350 mg/day makes loose stools especially likely, so splitting the dose with meals helps.
What should you not take magnesium with?
Space magnesium at least 2 hours before or 4–6 hours after tetracycline and quinolone antibiotics, which it binds and blocks. Very high-dose zinc (~142 mg/day) can interfere with magnesium absorption, and magnesium and calcium share an absorption pathway, so separate large simultaneous doses.
What is the best time of day to take magnesium glycinate?
Follow the label. Many people take glycinate with an evening meal or snack, but no trial shows that one hour is better than another. Taking it every day with food matters more than the hour; split a larger dose between two meals if it loosens your stools.
Which magnesium glycinate costs the least per 200 mg of magnesium?
BulkSupplements Magnesium Glycinate Powder costs $0.12 per 200 mg of magnesium, the lowest of the 6 glycinate supplements we price (NSF/ANSI 173). Nature Made Magnesium Glycinate costs $0.20; Vitamin Shoppe Magnesium Glycinate costs $0.22; Doctor's Best High Absorption Magnesium costs $0.23; KAL Magnesium Glycinate costs $0.24; Thorne Magnesium Glycinate costs $0.48. Prices were recorded on October 9, 2026.
Related guides
- Magnesium Dosage Guide · Magnesium Forms Compared · Magnesium and Sleep · Magnesium Amounts in Sleep Studies
- Taking Magnesium with Vitamin D
Sources
- NIH Office of Dietary Supplements. Magnesium Fact Sheet for Health Professionals. ods.od.nih.gov