Loading…
We use essential cookies (authentication, your saved goals/stack) by default. With your permission we’ll also enable privacy-respecting analytics (Vercel Web Analytics, anonymous load-time metrics) and error-replay diagnostics (Sentry — DOM snapshots only when an error fires) so we can fix bugs faster. Learn more about cookies
Head-to-head evidence comparison — which supplement is right for you?
Calcium vs Folic Acid: they're closely matched on evidence (5.5 vs 8/10); 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 Folic Acid are closely matched across evidence, studies, and safety.
Verdict
Too few graded studies
Top outcomes
Verdict
Too few graded studies
Top outcomes
Shared outcomes (2)
Outcomes where both Calcium and Folic Acid have evidence — compare verdict strength side-by-side.
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
400 mcg/day for anyone planning or capable of pregnancy (USPSTF: 400-800 mcg); adult RDA 400 mcg DFE/day, 600 mcg DFE in pregnancy, 500 mcg DFE in lactation (IOM)
Any time of day
Folic acid (pteroylmonoglutamic acid)
and 7 more not shown
6-24 months
12-36 months
Throughout pregnancy
Within days of starting
Periconceptional
Weeks
Weeks to months
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.
Prevention of the first occurrence of neural-tube defects by periconceptional vitamin supplementation.
N Engl J Med (1992) · Rct
Randomised trial of periconceptional vitamin supplementation for prevention of a FIRST neural tube defect (PubMed publication types: Randomized Controlled Trial, Clinical Trial)
Prevention of neural tube defects: results of the Medical Research Council Vitamin Study. MRC Vitamin Study Research Group.
Lancet (1991) · Rct
Randomised, multicentre trial of periconceptional folic acid for prevention of RECURRENT neural tube defects (PubMed publication types: Randomized Controlled Trial, Multicenter Study, Comparative Study)
Effects and safety of periconceptional oral folate supplementation for preventing birth defects.
Cochrane Database Syst Rev (2015) · Meta analysis
Cochrane Database of Systematic Reviews CD007950, third edition (PubMed publication types: Meta-Analysis, Systematic Review)
Both Calcium and Folic Acid are closely matched — the best choice depends on your specific health goals.
For prenatal support, Folic Acid has a higher relevance score (95 vs 40).
No documented interaction was found in the data searched. This does not establish that this exact combination is safe.
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.
Commonly recommended vs ask-your-clinician vs avoid — a general, safety-first overview.
The right pick depends on your goals. Answer a few quick questions for a personalised recommendation — or dig into the full evidence on each.