Magnesium Glycinate 400mg
by Solgar
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Solgar Magnesium Glycinate 400mg is a premium chelated magnesium supplement widely praised by reviewers for improving sleep quality, reducing muscle cramps, and easing nervous tension. Best for People with sleep difficulties or insomnia and Those experiencing muscle cramps or restless legs.
According to the AIScored 0–100 scoring system, Magnesium Glycinate 400mg by Solgar scores 80.0/100, ranking #2 out of 19 products in Magnesium (2026). Strongest category: Ingredient Quality (88.0/100). Weakest: Value For Money (70.0/100).
Is Magnesium Glycinate 400mg worth buying?
“Solgar's Magnesium Glycinate is a genuinely effective 400mg supplement scoring 80 out of 100, with users consistently reporting better sleep and fewer muscle cramps thanks to the chelated form that your body absorbs well. If you've had digestive issues with other magnesium supplements, this one's notably gentler while still delivering the calming effects you're after.”
What Do Reviewers Say About Magnesium Glycinate 400mg?
Sample excerpts from currently available source material used in this product analysis.
"Hello all. I have posted here and other subs since 2024 with my many struggles that appeared out of nowhere. Both my neurologist and primary doctor concluded that my low vitamin d, e, and creatinine levels, coupled with stress sent my body..."
"It’s hard for me to wind down in the evening, so magnesium has helped a little with that. My anxiety was horrific due to the vitamins all being low at the same time. After the increase with the vitamin d and e alone, I noticed a significant..."
"IMO i think the only thing that may not be necessary is the one a day and typically creatine is way cheaper not in capsule form. Glad you are feeling awesome. B vitamins and magnesium made the difference to me. Sounds like you just nuked an..."
"You could try this…. L-Theanine https://a.co/d/fD4sytg R-ALA https://a.co/d/2UJwiNO magnesium glycinate https://a.co/d/1Cdk9lG B-complex https://a.co/d/hpHsUnn"
"Hey everyone! I got a positive breath test about 8 months ago - hydrogen was 30 ppm, and methane was 12 ppm. Maybe there's also H₂S involved, but the test only checked for two gases, so who knows for sure. My only symptom is mushy stool wit..."
How does Magnesium Glycinate 400mg score?
Detailed score breakdown and key findings from our analysis of 76 reviews across 3 sources.
Pros
- +Strong user-reported improvement in sleep quality — faster onset and fewer nighttime awakenings
- +Effective at reducing leg cramps, muscle tension, and post-exercise soreness
- +Glycinate chelate offers high bioavailability and is generally gentle on the digestive system
- +Clean, minimal formula — gluten-free, dairy-free, non-GMO, kosher-certified; trusted Solgar brand
- +Positive secondary benefits reported: reduced anxiety, fewer migraines, calmer stress response
Cons
- -Paradoxical insomnia or restless sleep in a subset of users, possibly linked to MTHFR mutations or glycine sensitivity — magnesium threonate may suit these individuals better
- -Large tablet/capsule size noted as inconvenient by multiple reviewers
- -Premium brand pricing is higher than comparable chelated magnesium products
- -High doses may disrupt calcium balance, contributing to eye twitching or muscle symptoms in some users
Best For
Watch Out
- !Users with MTHFR mutations may experience wakefulness or excitatory effects — consider magnesium threonate or malate instead
- !Can cause mild laxative effect, especially at full 400mg dose; start low
- !Long-term high-dose use without adequate dietary calcium may worsen muscle symptoms (calcium:magnesium balance)
- !Some iHerb reviews in the dataset reference magnesium citrate rather than glycinate — effects are broadly similar but glycinate is generally milder on the gut and less laxative
What is Magnesium Glycinate 400mg?
Magnesium Glycinate 400mg is a magnesium product by Solgar, scoring 80.0/100 on AIScored.
- • Solgar Magnesium Glycinate provides 400mg of magnesium per serving in the absorbable glycinate form.
- • Based on user reports, it is commonly taken to support sleep, ease muscle tension, relieve nerve discomfort, help prevent migraines, and promote digestive comfort.
- • Available in capsule form, it is a convenient option for those looking to add a chelated magnesium supplement to their daily routine.
How We Score Supplements
Our methodology analyses review data, ingredient science, and product information, then scores each product on a 0-100 scale across evidence-based categories:
Effectiveness
How well the product delivers its claimed benefits, based on reviews and ingredient evidence.
Ingredient Quality
Bioavailable forms, clinically effective dosages, clean label, minimal fillers.
Value for Money
Price relative to ingredient quality, dosage count, and effectiveness.
Side Effects Profile
Higher score = fewer side effects. 100 means virtually no adverse reactions reported.
Certifications & Testing
Third-party lab testing, GMP certification, and independent quality verification.
Overall Score
Weighted combination of all factors. Our bottom-line recommendation.
Price History (90 days)
Frequently Asked Questions
Is Magnesium Glycinate 400mg worth buying in 2026? ▼
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What the Data Says About Magnesium
Why is magnesium oxide less effective than glycinate?
Oxide scores 21 points lower than glycinate in our testing — and it's not close on ingredient quality either. Across 17 magnesium products in our database, glycinate averages 74.3/100 overall. Oxide sits at 53/100. That's a gap you can feel.
The ingredient quality difference is even starker: 83.3 for glycinate vs 37.0 for oxide. A 46.3-point gap. The best glycinate in our database, Solgar Magnesium Glycinate 400mg, scores 80/100 overall with 88/100 on ingredient quality. The oxide product (Nature Made) manages just 52 on effectiveness and 37 on ingredient quality.
The reason is bioavailability. Magnesium oxide has roughly 4% absorption — most of it passes straight through your gut unused. Glycinate is chelated (bound to the amino acid glycine), which your intestines absorb much more efficiently. You also get fewer digestive side effects, since unabsorbed magnesium in the gut is what causes the laxative effect oxide is known for.
Oxide is cheap, which is why it's still everywhere. But cheap per pill means nothing if your body can't use it. Glycinate or citrate (avg 74.5/100) are both better choices.
Which form of magnesium is best for sleep, anxiety, or muscle cramps?
Glycinate for sleep and anxiety. Citrate for cramps. L-threonate for brain function. Each form has a different strength, and our scores back this up.
Sleep and anxiety → Glycinate. Averaging 74.3/100 across our database, with the best (Solgar Glycinate 400mg) hitting 80/100. Glycine, the amino acid it's bound to, acts as an inhibitory neurotransmitter — it calms your nervous system on its own. That's a two-for-one benefit you don't get from other forms. Thorne Bisglycinate (74/100) is another solid option at a lower dose.
Muscle cramps → Citrate. Averaging 74.5/100 overall with 85.0 on ingredient quality. Citrate absorbs well and is gentler on your wallet than glycinate. Solgar Citrate leads the pack at 77/100. If cramps are your main issue, this is the practical choice.
Brain function → L-Threonate. Life Extension Neuro-Mag scores 73/100. This is the only form shown to meaningfully raise magnesium levels in the brain by crossing the blood-brain barrier. It's pricier, but nothing else does what it does.
All-round absorption → Doctor's Best High Absorption tops our entire magnesium database at 82/100 overall (83 effectiveness, 88 ingredient quality) using chelated magnesium.
The one form to skip? Oxide at 53/100. Its 4% absorption rate makes it a poor choice no matter what you're taking it for.
Disclaimer: AIScored provides research-backed summaries based on publicly available reviews and product information. This is not medical advice. Always consult a healthcare professional before starting any supplement regimen. Affiliate links may earn us a commission at no extra cost to you.
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