Double Wood Magnesium Glycinate 400mg vs NatureWise Vitamin D3 5000 IU: Which Should You Buy? (UK 2026)
🥤 Products Compared
📊 Specs Comparison
| Feature | Double Wood Magnesium Glycinate 400mg | NatureWise Vitamin D3 5000 IU |
|---|---|---|
| Price | £9.73 | £10.06 |
| Rating | 4.7/5 | 4.8/5 |
| Key Feature 1 | 400mg magnesium bisglycinate per capsule (60mg elemental magnesium) | 5000 IU (125 mcg) vitamin D3 per softgel, suspended in organic olive oil |
| Key Feature 2 | NSF certified; ISO 17025-accredited third-party lab testing | USP Grade and NSF certified; non-GMO, halal gelatin softgel |
| Weight/Capacity | 180 veggie capsules (6-month supply at 1 daily) | 360 softgels (360-day supply at 1 daily) |
| Certifications | NSF certified, vegan, gluten-free, non-GMO, USA manufactured | USP Grade, NSF certified, gluten-free, non-GMO |
✓ Double Wood Magnesium Glycinate 400mg
- ✓ Chelated bisglycinate form absorbs better than magnesium oxide or citrate, with no laxative side effects at standard doses
- ✓ 180 capsules at one daily is a 6-month supply for under £10
- ✓ Third-party tested by an ISO 17025-accredited lab with a published Certificate of Analysis
- ✓ Vegan veggie capsule shell; free from gluten, soy, and dairy
- ❌ Only 60mg elemental magnesium per capsule; reaching a 120mg daily target requires two capsules, effectively doubling the per-dose cost
- ❌ Capsule size is larger than average, which some users find difficult to swallow
✓ NatureWise Vitamin D3 5000 IU
- ✓ 360 softgels in one bottle is a full year's supply at one softgel per day
- ✓ Delivered in certified organic extra virgin olive oil, which improves absorption of this fat-soluble vitamin
- ✓ Carries both NSF certification and a USP Grade marking, two independent quality standards
- ✓ Small, easy-to-swallow softgels consistently described by reviewers as gentle on the stomach
- ❌ 5000 IU far exceeds the NHS general-prevention guidance of 400 IU daily; a baseline 25(OH)D blood test before starting is advisable to avoid toxicity from long-term accumulation
- ❌ Contains halal gelatin, making it unsuitable for vegans; a separate NatureWise vegan D3 formula exists but is a different product
📝 User Reviews
Amazon buyers of Double Wood Magnesium Glycinate frequently cite improved sleep within two weeks and note the larger-than-average capsule size. NatureWise Vitamin D3 reviewers praise the compact softgel format and report noticeable energy and mood improvements, with UK buyers in particular citing it as a winter staple from October through March.
🏆 Verdict
For home gym users whose main complaints are poor sleep and lingering muscle soreness, Double Wood Magnesium Glycinate at £9.73 delivers six months of well-absorbed, thoroughly tested magnesium. If vitamin D deficiency is the concern, NatureWise at £10.06 provides a 360-day supply at a dose typically used to correct established deficiency, though checking your 25(OH)D blood level before committing to 5000 IU daily is the sensible first step.
Double Wood Magnesium Glycinate best for home gym users who train in the evening and want to improve sleep onset and reduce post-workout muscle tension. NatureWise Vitamin D3 best for UK adults who spend most daylight hours indoors or live above 52 degrees north latitude and need a therapeutic dose to correct confirmed vitamin D deficiency.
❓ FAQs
Can you take both supplements at the same time?
Yes. Magnesium acts as a cofactor in the two hydroxylation steps that convert ingested D3 into calcitriol, its active form. A 2022 randomised controlled trial (PMID 35576873) found combined supplementation raised serum 25-hydroxyvitamin D more effectively than D3 alone.
Is 5000 IU of vitamin D3 safe for daily use in the UK?
The NHS advises 400 IU for general prevention and notes that up to 4000 IU daily is unlikely to cause harm in most adults. 5000 IU is commonly used to correct confirmed deficiency, but a baseline 25(OH)D blood test before starting is the sensible approach to avoid toxicity from excess accumulation over time.
How long does each bottle last?
Double Wood Magnesium Glycinate contains 180 capsules; at one per day that is exactly six months. NatureWise Vitamin D3 contains 360 softgels, which at one per day is a full calendar year from a single purchase.