Nature Made Magnesium L-Threonate with Vitamins C & D3 supplement bottle
Nature Made

Magnesium L-Threonate with Vitamins C & D3 Review

What We Researched
4 active ingredients analyzed · 4 inactive ingredients decoded · 5 brand certifications checked · Page generated: Sep 2026
76
Product Score Fair
95
Brand Score Excellent

Two independent scores — the product and the brand behind it, never blended into one number. See our methodology.

Product Analysis

Transparency Excellent

Supplement Facts

IngredientAmount% DV
Vitamin D 10 mcg —
Magnesium L-Threonate 1800 mg —
Vitamin C 60 mg —
Magnesium 130 mg —
Bioavailability Very Good

Absorption Rating

  • Vitamin D Good
  • Magnesium L-Threonate Good
  • Vitamin C Fair
  • Magnesium Good
Other Ingredients Excellent

Fillers & Additives

  • Hypromellose
  • Magnesium Stearate
  • Cellulose Gel
  • Silicon Dioxide
Efficacy Very Poor

Dosage Analysis

  • Vitamin D 10 mcg Under-dosed
  • Magnesium L-Threonate 1800 mg High
  • Vitamin C 60 mg Under-dosed
  • Magnesium 130 mg Under-dosed

Supplement Facts

Ingredient Amount % Daily Value
Vitamin D 10 mcg
Magnesium L-Threonate 1800 mg
Vitamin C 60 mg
Magnesium 130 mg

Other Ingredients

Inactive ingredients used in manufacturing. All rated for safety.

Hypromellose Safe

Forms vegetarian capsule shells. Dissolves easily in the stomach.

Magnesium Stearate Safe

Prevents ingredients from sticking to manufacturing equipment during tableting.

Cellulose Gel Generally_safe

It is used as a thickening agent to improve the texture of supplements.

Silicon Dioxide Safe

Prevents clumping and ensures consistent dosing.

Brand Trust Report
Nature Made

Founded 1971 · West Hills, California, USA · 701 products · naturemade.com

Certifications

5 certifications
Consumerlab Source available Primary evidence
Labdoor Source available Primary evidence
Usp Verified Source available Primary evidence
Fda Gmp Inspections Source available Primary evidence
NSF Certified Supporting evidence unavailable

Transparency

5 claims
Third Party Testing Claim — Verified Evidence available Evidence
Coa Availability — Claimed Evidence available Evidence
In House Testing — Verified Evidence available Evidence
Testing Lab Disclosure — True Brand claim; evidence unavailable

Violation History

2 incidents
Lawsuit Presence of toxic plastic chemicals in prenatal multivitamins.2025 Source available Primary source
Recall Specific lots of Nature Made Adult Gummies Multi, Multi + Omega-3, Multi for Her plus Omega-3s, and Super B Complex w/C & Folic Acid2016-06-15 Source available Primary source
Related Supplements
Frequently Asked Questions
Is Nature Made Magnesium L-Threonate with Vitamins C & D3 a good supplement?

Nature Made Magnesium L-Threonate with Vitamins C & D3 received a product quality score of 76/100 in GoodSupp's independent analysis, suggesting some areas that could be improved. The product contains 4 active ingredients with 25 servings per container. All 4 inactive ingredients (fillers, binders, capsule materials) are rated safe — a clean formulation with no flagged additives. The manufacturer, Nature Made, holds a brand trust score of 95/100.

What are the ingredients in Nature Made Magnesium L-Threonate with Vitamins C & D3?

Nature Made Magnesium L-Threonate with Vitamins C & D3 contains 4 active ingredients: Vitamin D (10 mcg), Magnesium L-Threonate (1800 mg), Vitamin C (60 mg), Magnesium (130 mg). Each ingredient's dosage, form, and safety rating is analyzed independently in GoodSupp's full product breakdown.

Is Nature Made Magnesium L-Threonate with Vitamins C & D3 safe to take?

GoodSupp reviewed the inactive-ingredient data available for Nature Made Magnesium L-Threonate with Vitamins C & D3. All 4 inactive ingredients — including capsule materials, fillers, and binders — are currently classified as safe in GoodSupp's ingredient reference data. This label analysis cannot determine whether the product is safe for a particular person, and source labels may change. Always consult your healthcare provider before starting any new supplement, especially if you take medications or have underlying health conditions.

Is Nature Made a trustworthy supplement brand?

Nature Made receives a brand trust score of 95/100 based on GoodSupp's independent analysis of certifications, regulatory history, and transparency practices. Founded in 1971 and headquartered in West Hills, California, USA, the company offers 701 products in their lineup. Note: Nature Made has 2 historical regulatory incidents on record, which are factored into the trust score.

What is magnesium good for?

Magnesium Good For is a topic many supplement consumers ask about. In the context of dietary supplements, understanding magnesium good for helps you make more informed choices about what you put in your body. The quality and form of ingredients matters significantly — two products listing the same ingredient can differ dramatically in bioavailability and effectiveness. GoodSupp analyzes over 150,000 supplement products to help consumers understand exactly what's in their supplements and whether the formulation meets quality standards.

How much magnesium per day?

The optimal dosage depends on your individual health needs, age, sex, and current nutrient levels. Recommended daily amounts are established by health authorities but may vary from therapeutic doses used in clinical research. It's important to check the Supplement Facts label for the exact amount per serving and compare it against the % Daily Value. Some supplements provide mega-doses well above the Daily Value, which may not be necessary and in some cases could be harmful — particularly for fat-soluble vitamins (A, D, E, K) that accumulate in the body. GoodSupp's efficacy analysis evaluates whether a product's dosages align with clinically studied amounts. Always consult your healthcare provider for personalized dosage recommendations.

What is zinc good for?

Zinc Good For is a topic many supplement consumers ask about. In the context of dietary supplements, understanding zinc good for helps you make more informed choices about what you put in your body. The quality and form of ingredients matters significantly — two products listing the same ingredient can differ dramatically in bioavailability and effectiveness. GoodSupp analyzes over 150,000 supplement products to help consumers understand exactly what's in their supplements and whether the formulation meets quality standards.

Scan Any Supplement Instantly

Download GoodSupp to scan barcodes, check ingredient safety, and find the best supplements for your needs.

Disclaimer: GoodSupp provides independent supplement quality analysis for informational purposes only. Scores are generated algorithmically based on ingredient profiles, brand certifications, and public records — read our methodology. This is not medical advice. Always consult a healthcare professional before starting any supplement regimen. Product data is sourced from manufacturer labels and public databases. GoodSupp is not affiliated with any supplement brand.