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Head-to-head evidence comparison — which supplement is right for you?
Calcium vs Prenatal Multivitamin: they're closely matched on evidence (5.5 vs 7/10); they're alternatives for prenatal support — the best pick depends on your goals. Take the 60-second quiz for a pick tailored to your goals.
Calcium and Prenatal Multivitamin are closely matched across evidence, studies, and safety.
Verdict
Too few graded studies
Top outcomes
Verdict
Too few graded studies
Top outcomes
1000–1200mg daily (split doses) (no cited trial states the dose it used)
Split doses with meals, 500mg with breakfast, 500mg with dinner
Calcium Citrate
1 serving daily as labelled. The verified folic acid evidence rests on 400-800 mcg daily started before conception
With meals
A prenatal containing 400-800 mcg folic acid, started at least one month before conception
and 7 more not shown
and 4 more not shown
A separate calcium dose taken at the same time as the prenatal reduces absorption of the prenatal's iron.
Separate by 2+ hours — take the prenatal and any calcium supplement at different times of day.
6-24 months
12-36 months
Throughout pregnancy
Within days of starting
Best started before conception
Across pregnancy
Across pregnancy
n/a
Use of calcium or calcium in combination with vitamin D supplementation to prevent fractures and bone loss in people aged 50 years and older: a meta-analysis
Lancet (2007) · Meta analysis · n=63897
29 randomised trials, 63,897 participants aged 50 or older, pooled with a random-effects model.
Role of calcium and/or vitamin D supplementation in preventing osteoporotic fracture in the elderly: a systematic review and meta-analysis
Indian J Med Res (2023) · Meta analysis
18 RCTs in adults over 60, comparing calcium, vitamin D or both against no treatment or placebo.
Calcium and vitamin D for increasing bone mineral density in premenopausal women
Cochrane Database Syst Rev (2023) · Systematic review · n=941
7 RCTs, 941 healthy premenopausal women: 138 randomised to calcium, 110 to vitamin D, 271 to both, 422 to placebo. Mean ages 18.1 to 42.1.
Effects and safety of periconceptional oral folate supplementation for preventing birth defects.
Cochrane Database Syst Rev (2015) · Meta analysis
Neural tube defects: RR 0.31 (95% CI 0.17-0.58) across 5 studies, 6,708 births — HIGH quality evidence
Prevention of neural tube defects: results of the Medical Research Council Vitamin Study. MRC Vitamin Study Research Group.
Lancet (1991) · Rct · n=1817
27 neural tube defects total: 6 in folic acid arms vs 21 in non-folic-acid arms — 72% protective effect, RR 0.28 (95% CI 0.12-0.71)
Prevention of the first occurrence of neural-tube defects by periconceptional vitamin supplementation.
N Engl J Med (1992) · Rct · n=4753
The comparator was NOT placebo — it was a trace-element supplement (copper, manganese, zinc and a very low dose of vitamin C)
Both Calcium and Prenatal Multivitamin are closely matched — the best choice depends on your specific health goals.
For prenatal support, Prenatal Multivitamin has a higher relevance score (96 vs 40).
A separate calcium dose taken at the same time as the prenatal reduces absorption of the prenatal's iron. Separate by 2+ hours — take the prenatal and any calcium supplement at different times of day. Consult a healthcare provider for personalized advice.
Hot flashes, bone, sleep, muscle — the basics that hold up vs the phytoestrogen hype.
When to take what, with or without food, and which supplements compete vs pair well.
Folate is essential; inositol + CoQ10 are the best bets — but conception evidence is limited.
What’s safe while nursing, the truth about milk-supply herbs, and what to avoid (it passes into milk).
The right pick depends on your goals. Answer a few quick questions for a personalised recommendation — or dig into the full evidence on each.