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 Clomiphene (Clomid): Calcium has the stronger overall evidence (8 vs 4.8/10); they're alternatives for fertility support — the best pick depends on your goals. Take the 60-second quiz for a pick tailored to your goals.
Calcium wins 3 of 3 categories. Both are solid choices — the best pick depends on your specific goals.
Verdict
Likely helps
18 of 20 studies with measurable effects showed benefit.
Top outcomes
Verdict
Mostly mechanism / observational
Top outcomes
Shared outcomes (1)
Outcomes where both Calcium and Clomiphene (Clomid) have evidence — compare verdict strength side-by-side.
1000–1200mg daily (split doses)
Split doses with meals, 500mg with breakfast, 500mg with dinner
Calcium Citrate
Off-label (male) / approved (female) — clinician-directed. For female ovulation induction the approved regimen is 50 mg once daily for 5 days starting early in the cycle, titrated up to 100-150 mg if needed. For off-label male hypogonadism, observational studies used roughly 25-50 mg daily or every other day (25 mg/day is the most common starting dose), titrated to testosterone and LH/FSH response. There is no FDA-approved male dose.
any
Clomiphene citrate tablets (racemic — approved for women; off-label in men)
6-24 months
12-36 months
Throughout pregnancy
Within days of starting
Per cycle (5-10 day course)
Weeks to a few months
Within 3-6 months
N/A
Effects of combined calcium and vitamin D supplementation on osteoporosis in postmenopausal women: a systematic review and meta-analysis of randomized controlled trials.
Food & Function (2020) · Meta analysis · n=12000
Combined calcium and vitamin D significantly improved lumbar spine BMD in postmenopausal women
Association Between Calcium or Vitamin D Supplementation and Fracture Incidence in Community-Dwelling Older Adults: A Systematic Review and Meta-analysis.
JAMA (2017) · Meta analysis · n=51145
33 trials involving 51,145 participants were analyzed
Vitamin D and Calcium for the Prevention of Fracture: A Systematic Review and Meta-analysis.
JAMA Network Open (2019) · Meta analysis · n=51419
Meta-analysis of 11 randomized clinical trials with 51,419 participants
Clomiphene citrate for men with hypogonadism: a systematic review and meta-analysis.
Andrology (2022) · Meta analysis · n=1642
Systematic review and meta-analysis of clomiphene citrate for male hypogonadism — 19 studies (4 RCTs, 15 observational), 1,642 patients; 17 studies (1,279 patients) in the meta-analysis
Letrozole versus clomiphene for infertility in the polycystic ovary syndrome.
N Engl J Med (2014) · Rct · n=750
Double-blind, multicenter RCT (NCT00719186) of 750 women with PCOS randomized 1:1 to letrozole vs clomiphene for up to five cycles; primary outcome live birth
Clomiphene and other antioestrogens for ovulation induction in polycystic ovarian syndrome.
Cochrane Database Syst Rev (2016) · Systematic review
Cochrane systematic review of clomiphene and other antioestrogens for ovulation induction in anovulatory PCOS subfertility
Based on meta-analysis of 59 RCTs showing 0.6-1.8% BMD increases. Requires vitamin D co-supplementation for optimal effect. Effectiveness plateaus beyond 1200mg daily.
AI-estimated from published studies. Interpret as directional guidance.
Calcium has a higher evidence score (8/10 vs 4.8/10) and wins in 3 of 3 categories.
For fertility support, Calcium has a higher relevance score (65 vs 64).
No known interactions between Calcium and Clomiphene (Clomid) have been documented in our database. However, always consult a healthcare provider before combining supplements.
The right pick depends on your goals. Answer a few quick questions for a personalised recommendation — or dig into the full evidence on each.