Magnesium Glycinate 400mg vs Magnesium Citrate 120 Tablets
Side-by-side comparison of scores, ingredients, prices and real customer feedback for Magnesium Glycinate 400mg and Magnesium Citrate 120 Tablets.
Last verified: 07 Apr 2026 · Based on 131 reviews
Magnesium Glycinate 400mg scores 80.0/100 vs Magnesium Citrate 120 Tablets at 72.0/100. Magnesium Glycinate 400mg wins on effectiveness, ingredient quality, value for money.
Which is better: Magnesium Glycinate 400mg or Magnesium Citrate 120 Tablets?
Solgar Magnesium Glycinate wins clearly — higher overall score (80 vs 72) and lower price (£12.25 vs £17.94) make it the better buy. Magnesium Citrate suits those who prioritise PMS or menopausal relief, where citrate's specific benefits may justify the premium despite its large, hard-to-swallow tablets.
— AIScored Editorial Team
How Do the Scores Compare?
Magnesium Glycinate 400mg
Solgar
|
Magnesium Citrate 120 Tablets
Solgar
|
|
|---|---|---|
| Overall Score | 80.0 | 72.0 |
| Effectiveness |
79.0/100
Best
|
76.0/100 |
| Ingredient Quality |
88.0/100
Best
|
84.0/100 |
| Value for Money |
70.0/100
Best
|
62.0/100 |
| Side Effects |
76.0/100
Best
|
71.0/100 |
| Certifications |
84.0/100
Best
|
50.0/100 |
| Best Price |
£12.25
Amazon UK →
Cheapest
|
£17.94 Amazon UK → |
| Form | N/A | tablet |
| Dose | N/A | None |
| Third-Party Tested | ✗ No | ✗ No |
| Reviews Analysed | 76 | 55 |
Magnesium Glycinate 400mg
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
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
Magnesium Citrate 120 Tablets
Pros
- ✓Highly bioavailable magnesium citrate form — better absorbed than oxide or carbonate
- ✓Consistently reported improvements in sleep quality and muscle relaxation
- ✓Effective for muscle cramps, PMS symptoms, and menopausal discomfort
- ✓Vegan, gluten-free, and kosher certified with clean excipients
Cons
- ✗Tablet size is unusually large — multiple reviewers report difficulty swallowing and choking risk
- ✗No third-party analytical testing (e.g., Informed Sport, NSF)
- ✗Premium price point relative to generic magnesium citrate alternatives
- ✗High single-serving dose (400mg) may cause loose stools in sensitive individuals
Best For
What does the data say about Magnesium Glycinate 400mg vs Magnesium Citrate 120 Tablets?
Both products are from Solgar and use well-absorbed forms of magnesium, but the form itself differs. Magnesium Glycinate 400mg uses a glycinate chelate, which scores 88/100 for ingredient quality and sits at £12.25. The citrate version scores 84/100 for ingredient quality and costs considerably more at £17.94 despite the lower overall score of 72/100 against the glycinate's 80/100. Glycinate is noted for being gentle on the digestive system, while citrate is better absorbed than cheaper forms like oxide or carbonate — both are decent choices, but the glycinate edges ahead on nearly every scored metric, including value at 70/100 versus 62/100.
For sleep difficulties, muscle cramps, or chronic stress, the Magnesium Glycinate 400mg is the stronger pick. User reports point to faster sleep onset and fewer nighttime awakenings, and the effectiveness score of 79/100 slightly beats the citrate's 76/100. If you're specifically dealing with PMS or menopausal discomfort, the citrate version has a track record for those symptoms and may be worth considering despite the higher price. People who've struggled with magnesium and digestive upset in the past are more likely to get on well with the glycinate form.
Tablet size is a genuine issue with both. The glycinate has been flagged for large capsules, and the citrate tablets have attracted multiple complaints about being difficult to swallow, with some reviewers mentioning a choking risk. That's not a minor quibble. Additionally, a small number of glycinate users report paradoxical sleep disruption — if that happens to you, switching to magnesium threonate is worth exploring rather than assuming magnesium doesn't work for you.
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.
What are the key differences?
Frequently Asked Questions
Which is better, Magnesium Glycinate 400mg or Magnesium Citrate 120 Tablets? ▼
Is Magnesium Glycinate 400mg worth the price compared to Magnesium Citrate 120 Tablets? ▼
Which has fewer side effects? ▼
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What the Data Says
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 data-driven comparisons based on publicly available reviews. This is not medical advice. Affiliate links may earn us a commission at no extra cost to you.
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