Doctor's Best High Absorption Magnesium 100mg vs Nutravita Magnesium Supplements 5-in-1 Complex 1146mg - Which? Best Buy 2025-240 High Strength Capsules - 400mg Elemental Magnesium: Bisglycinate, Citrate, Malate, Oxide, Ascorbate - Muscles & Sleep
Side-by-side comparison of scores, ingredients, prices and real customer feedback for Doctor's Best High Absorption Magnesium 100mg and Nutravita Magnesium Supplements 5-in-1 Complex 1146mg - Which? Best Buy 2025-240 High Strength Capsules - 400mg Elemental Magnesium: Bisglycinate, Citrate, Malate, Oxide, Ascorbate - Muscles & Sleep.
Last verified: 07 Apr 2026 · Based on 67 reviews
Doctor's Best High Absorption Magnesium 100mg scores 82.0/100 vs Nutravita Magnesium Supplements 5-in-1 Complex 1146mg - Which? Best Buy 2025-240 High Strength Capsules - 400mg Elemental Magnesium: Bisglycinate, Citrate, Malate, Oxide, Ascorbate - Muscles & Sleep at 73.0/100. Doctor's Best High Absorption Magnesium 100mg wins on effectiveness, ingredient quality, certifications. Nutravita Magnesium Supplements 5-in-1 Complex 1146mg - Which? Best Buy 2025-240 High Strength Capsules - 400mg Elemental Magnesium: Bisglycinate, Citrate, Malate, Oxide, Ascorbate - Muscles & Sleep is stronger on value for money and side effects.
How Do the Scores Compare?
Doctor's Best High Absorpti...
Doctor's Best
|
Nutravita Magnesium Supplem...
Nutravita
|
|
|---|---|---|
| Overall Score | 82.0 | 73.0 |
| Effectiveness |
83.0/100
Best
|
72.0/100 |
| Ingredient Quality |
88.0/100
Best
|
64.0/100 |
| Value for Money | 78.0/100 |
82.0/100
Best
|
| Side Effects | 84.0/100 |
85.0/100
Best
|
| Certifications |
72.0/100
Best
|
68.0/100 |
| Best Price | £26.40 Amazon UK → |
£15.99
Amazon UK →
Cheapest
|
| Price per Serving |
£0.22
120 servings
Best value
|
£15.99 1 servings |
| Form | Tablets | Capsule |
| Dose | 100mg elemental (per 2 tablets) | None |
| Third-Party Tested | ✓ Yes | ✗ No |
| Reviews Analysed | 57 | 10 |
Doctor's Best High Absorption Ma...
Pros
- ✓Strong, consistent sleep improvement reported across the majority of reviews
- ✓Albion TRAACS chelate — a gold-standard chelation technology with superior bioavailability
- ✓Effective for muscle relaxation, cramp reduction, and post-exercise recovery
- ✓Gentle on the stomach; chelated form minimises the laxative effect common with other magnesium types
Cons
- ✗Tablets are notably large — at least two reviewers found them difficult or impossible to swallow whole
- ✗Only 60 servings per bottle at the recommended 2-tablet dose, despite the 120-tablet count on the label
- ✗No NSF Certified for Sport or USP verification — third-party testing scope is not fully specified
- ✗One Amazon report of a mismatched label on the bottle raises an authenticity/sourcing concern for that channel
Best For
Nutravita Magnesium Supplements ...
Pros
- ✓Multiple reviewers report genuine improvements in night-time muscle cramps and sleep depth
- ✓400mg elemental magnesium is a full therapeutic dose — not token amounts
- ✓Includes bisglycinate and citrate, two of the best-absorbed forms available
- ✓Which? Best Buy 2025 rating and UK GMP/BRC manufacturing standards
Cons
- ✗Magnesium oxide is the lowest-bioavailability form (~4%) and pads the blend without proportional benefit
- ✗Per-form ratios are not disclosed — you cannot tell how much bisglycinate versus oxide you're actually getting
- ✗Not independently third-party tested; GMP/BRC covers manufacturing process, not label accuracy
- ✗One reviewer explicitly notes this is a suboptimal choice if sleep is the primary goal — glycinate or L-threonate alone may work better
Best For
What does the data say about Doctor's Best High Abs... vs Nutravita Magnesium Su...?
Doctor's Best High Absorption Magnesium uses Albion TRAACS magnesium bisglycinate chelate, a premium chelated form widely regarded as among the most bioavailable magnesium options available.
What are the key differences?
Frequently Asked Questions
Which is better, Doctor's Best High Absorption Magnesium 100mg or Nutravita Magnesium Supplements 5-in-1 Complex 1146mg - Which? Best Buy 2025-240 High Strength Capsules - 400mg Elemental Magnesium: Bisglycinate, Citrate, Malate, Oxide, Ascorbate - Muscles & Sleep? ▼
Is Doctor's Best High Absorption Magnesium 100mg worth the price compared to Nutravita Magnesium Supplements 5-in-1 Complex 1146mg - Which? Best Buy 2025-240 High Strength Capsules - 400mg Elemental Magnesium: Bisglycinate, Citrate, Malate, Oxide, Ascorbate - Muscles & Sleep? ▼
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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