NOW Foods
Calcium & Magnesium
90/100
SUPPIE SCORE
85/100
EFFICACY
High
SAFETY
94/100
CLEANLINESS
What Does Calcium & Magnesium Do?
Well-dosed formula supports bone health effectively with evidence-backed calcium, magnesium, vitamin D synergy; safe for most adults, though high calcium may cause GI issues if not taken with food.
What are the benefits of combining calcium and magnesium for bone health?
How does vitamin D-3 enhance calcium absorption in this supplement?
Is zinc in this formula sufficient for immune support?
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What Are the Benefits of Calcium & Magnesium?
Based on proven scientific research
Bone HealthVery strong
Muscle FunctionStrong
Nervous System SupportStrong
Immune FunctionModerate
Good For:
What Are the Side Effects of NOW Foods Calcium & Magnesium?
Always consult your health practitioner if in doubt.
RiskLow Risk
Overview
•All ingredients are GRAS with dosages within safe upper limits (calcium ≤2,500 mg/day, magnesium ≤350 mg supplemental); no overdose risk for healthy adults.
•Potential mild GI side effects like constipation from calcium carbonate or diarrhea from magnesium in sensitive individuals; split doses recommended.
•Vitamin D-3 at 400 IU poses no hypercalcemia risk; zinc at 15 mg below UL of 40 mg, minimal nausea potential.
•Interactions: Calcium/magnesium may reduce absorption of antibiotics (tetracyclines, quinolones) or bisphosphonates; take separately by 2-4 hours.
•Suitable for pregnancy/lactation at recommended doses, but consult doctor; not for children under 18 without guidance.
•No allergens like gluten, soy, or nuts; vegan-free due to gelatin capsules, but low contamination risk from GMP manufacturing.
Potential Side Effects
Negative Interactions
Allergens
Gelatin (potential animal sensitivity)
Inactive Ingredients
Gelatin
Low RiskGlycerin
Low RiskWater
Low RiskWhat Are the Ingredients in NOW Foods Calcium & Magnesium?
Calcium (from Calcium Carbonate)
1,000 mg
Magnesium (from Magnesium Oxide and Citrate)
500 mg
Vitamin D-3 (as Cholecalciferol)
400 IU
Zinc (from Zinc Gluconate)
15 mg
Gelatin
Glycerin
Water
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Dosage & Bioavailability
How the active doses and forms in Calcium & Magnesium compare to the research.
•Calcium (from Calcium Carbonate) — 1,000 mg per serving; within the 800-1,000 mg/day used in studies.
•Magnesium (from Magnesium Oxide and Citrate) — 500 mg per serving is over the 350 mg/day upper limit (IOM (NIH ODS)).
•Vitamin D-3 (as Cholecalciferol) — 10 mcg per serving, which covers the daily reference intake (5 mcg EU NRV, 20 mcg US DV); higher-dose studies use 15-100 mcg/day.
Sources & References
Frequently Asked Questions
Common questions about NOW Foods Calcium & Magnesium