Calcium Magnesium Zinc with Vitamin D3, 100 Coated Tablets
by Nature's Bounty
Compare Prices
Several reviewers noticed leg cramps disappearing within a couple of weeks, and one user confirmed via blood tests that calcium and vitamin D3 deficiencies were corrected after a course — the most credible outcome in this set of reviews. Best for People wanting affordable, basic calcium and vitamin D3 supplementation in one bottle and Those with mild mineral deficiencies who are not particular about mineral form quality.
According to the AIScored 0–100 scoring system, Calcium Magnesium Zinc with Vitamin D3, 100 Coated Tablets by Nature's Bounty scores 60.0/100, ranking #35 out of 35 products in Vitamin D (2026). Strongest category: Side Effects (85.0/100). Weakest: Certifications (25.0/100).
Is Calcium Magnesium Zinc with Vita... worth buying?
“Nature's Bounty Calcium Magnesium Zinc with Vitamin D3 scores 68/100 and comes with 100 coated tablets that users genuinely appreciate for being easy to swallow with no taste, plus many report fewer muscle cramps within weeks. For the price, you're getting a straightforward mineral supplement without the hype — effective enough for basic bone and muscle support.”
What Do Reviewers Say About Calcium Magnesium Zinc with Vitamin D3, 100 Coated Tablets?
Sample excerpts from currently available source material used in this product analysis.
"Wonderful.. Magnesium is essential for normal nervous system and muscle function, heart health, sugar and blood pressure regulation, energy production, and protein synthesis. The product is of the highest quality, with pure ingredients and..."
"super ingredients. The Calcium, Magnesium and Zinc Complex with Vitamin D3 is of high quality: capsule-shaped tablets are easy to swallow, without foreign taste or smell. The composition includes calcium to support bones and teeth, magnesiu..."
"Excellent!. It was a very nice product. I bought it for my daughter's teacher 🥰 I also bought it separately so she could receive it together."
"A wonderful and excellent product. The scent is acceptable, the quality is high, and the size is acceptable. In general, the iHerb products are excellent. I honestly bought them for a customer of mine. May God provide for her from where she..."
"Good value for money. This product is more geared towards people who want to actively take calcium and vitamin D3. Apparently, taking zinc and magnesium together is inefficient. For those who want to take zinc and magnesium, I recommend tak..."
How does Calcium Magnesium Zinc with Vitamin D... score?
Detailed score breakdown and key findings from our analysis of 50 reviews across 1 source.
Pros
- +Multiple reviewers report muscle and leg cramps resolving within weeks of consistent use
- +Coated caplets are easy to swallow with no taste or smell — praised consistently across reviews
- +One reviewer confirmed via blood tests that calcium and vitamin D3 deficiencies were corrected after use
- +100 tablets covering four nutrients is a competitive value at this price point
- +Improved sleep and reduced fatigue noted by several users
Cons
- -Uses magnesium oxide — one of the lowest-bioavailability magnesium forms, absorbing far less than citrate or glycinate
- -Zinc oxide is similarly low-grade; picolinate or gluconate would deliver meaningfully better absorption
- -No third-party testing confirmed — only internal brand quality claims
- -Calcium carbonate requires adequate stomach acid; those on PPIs or with low acid production will absorb less
Best For
Watch Out
- !If magnesium for sleep or anxiety is the goal, a dedicated magnesium glycinate or citrate product will work noticeably better than magnesium oxide
- !Check your existing vitamin D3 intake before adding this — one reviewer flagged that D3 content can stack if you already supplement separately
- !Zinc and magnesium can compete for absorption when taken together at high doses — one reviewer raised this concern directly
- !No independent verification of label accuracy or contamination — relies solely on manufacturer self-reporting
What is Calcium Magnesium Zinc with Vitamin D3, 100 Coated Tablets?
Calcium Magnesium Zinc with Vitamin D3, 100 Coated Tablets is a vitamin d product by Nature's Bounty, scoring 60.0/100 on AIScored.
- • Product overview Description May Reduce the Risk of Osteoporosis* Mineral supplement 50 years of trusted quality At Nature's Bounty, we are committed to your health.
- • For 50 years we have been making trusted products, backed by science and made with only the purest ingredients.
- • And that’s guaranteed.
- • so you can get the most out of life every day.
- • Coated Caplets Quality guaranteed Laboratory tested *Adequate Calcium and Vitamin D throughout life, as part of a well-balanced diet, may reduce the risk of osteoporosis.
- • Suggested use For adults, take one (1) to three (3) caplets daily, preferably with a meal.
- • Other ingredients Vegetable cellulose.
- • Contains: <2% of: carnauba wax, vegetable glycerin, vegetable magnesium stearate.
- • Non-GMO, no artificial flavour, no artificial flavour, no artificial sweetener, no sugar, no milk, no lactose, no soy, no gluten, no wheat, no yeast, no fish.
- • Made in the USA with select ingredients from around the world.
- • Warnings Contains ingredients that may result in a variation of colour and appearance over time.
- • If you are pregnant, nursing, taking any medications or have any medical condition, consult your doctor before use.
- • Discontinue use and consult your doctor if any adverse reactions occur.
- • Keep out of reach of children.
- • Store at room temperature.
- • Do not use if seal under cap is broken or missing.
- • Disclaimer While iHerb strives to ensure the accuracy of its product images and information, some manufacturing changes to packaging and/or ingredients may be pending update on our site.
- • Although items may occasionally be despatched with alternative packaging, freshness is always guaranteed.
- • We recommend that you read labels, warnings and directions of all products before use and do not rely solely on the information provided by iHerb.
- • This website has been machine translated as a courtesy to customers.
- • iHerb does not represent or warrant that the translations are complete or error-free and iHerb is not responsible for any translation errors or.
Is Calcium Magnesium Zinc with Vitamin D3, 100 Coated Tablets Independently Tested?
No Third-Party Testing Visible
We could not find evidence of independent third-party testing for this product. This doesn't mean it's unsafe, but independent verification provides additional assurance.
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)
Quick Facts
- Vegan
- No
Frequently Asked Questions
Is Calcium Magnesium Zinc with Vitamin D3, 100 Coated Tablets worth buying in 2026? ▼
What is the best price for Calcium Magnesium Zinc with Vitamin D3, 100 Coated Tablets in the UK? ▼
What are the pros and cons of Calcium Magnesium Zinc with Vitamin D3, 100 Coated Tablets? ▼
Is Calcium Magnesium Zinc with Vitamin D3, 100 Coated Tablets third-party tested? ▼
What the Data Says About Vitamin D
Why do 97% of UK vitamin D supplements lack third-party certification?
Only 1 out of 35 vitamin D products we scored has independent certification. That's 97% without any third-party verification of purity, potency, or label accuracy.
This is worse than most supplement categories. The reason is simple: UK law doesn't require it, and testing costs money. Most vitamin D brands sell on price alone, especially in the D3-only space where the raw ingredient is cheap. Certification adds cost that budget brands won't absorb.
What does this mean for you? Without third-party testing, you're trusting the manufacturer's label claims. A 2021 study in Nutrients found that vitamin D supplements varied from 52% to 135% of their labelled dose. That's a problem if you're relying on a specific daily intake.
Among the 35 products we scored, the top performers are all from brands with strong manufacturing track records: NOW Foods D3 5000 IU and Thorne Vitamin D + K2 both score 87/100 overall. Thorne holds the highest certification score in the category at 85/100. If independent testing matters to you, that's the product to look at.
Do you need vitamin K2 with high-dose vitamin D?
Probably yes at high doses, and our data backs the pairing. Thorne Vitamin D + K2 Liquid is the only D3+K2 combo product in our 35-product database that scores 87/100 overall, matching the top-ranked D3-only options from NOW Foods. It also holds the highest certification score in the category at 85/100.
Here's the science behind it. Vitamin D increases calcium absorption from food. Vitamin K2 activates proteins that direct that calcium into bones and teeth, keeping it out of your arteries and soft tissue. At standard doses (1000-2000 IU daily), most people get enough K2 from diet to handle the extra calcium. At 4000-5000 IU daily, the calcium load increases enough that K2 becomes a more serious consideration.
The Endocrine Society doesn't yet include K2 in its vitamin D guidelines. But a growing body of research, including a 2019 meta-analysis in International Journal of Molecular Sciences, shows the D3+K2 combination improves bone mineral density more than D3 alone.
If you eat K2-rich foods regularly (natto, hard cheese, egg yolks, chicken liver), a standalone D3 product like NOW Foods D3 5000 IU 360 Softgels (87/100) is a solid choice. If your diet is low in K2, or you're taking 4000+ IU of D3 daily, Thorne D + K2 covers both bases in one product.
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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