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Head-to-head evidence comparison — which supplement is right for you?
Calcium vs Phosphatidylserine: Phosphatidylserine has the stronger overall evidence (6 vs 5.5/10); they work on different things and are often used together, not either/or. Take the 60-second quiz for a pick tailored to your goals.
Phosphatidylserine wins 2 of 3 categories. Both are solid choices — the best pick depends on your specific goals.
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
100-300mg daily
With meals, Evening or post-workout for cortisol
Soy or sunflower-derived phosphatidylserine
and 7 more not shown
Phosphatidylserine and calcium interact at the membrane level to support cell signaling. The combination may enhance neuromuscular function and osteoblast activity. No significant pharmacokinetic interference has been documented.
These can be taken together without timing concerns. The combination may be particularly useful for athletes seeking both cognitive support and musculoskeletal recovery.
6-24 months
12-36 months
Throughout pregnancy
Within days of starting
4-12 weeks
2 weeks
4-8 weeks
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 of a food supplement containing phosphatidylserine on cognitive function in Chinese older adults with mild cognitive impairment: A randomized double-blind, placebo-controlled trial
Journal of affective disorders (2025) · Rct · n=190
The capsule combined phosphatidylserine (63 mg/day) with α-linolenic acid, ginkgo flavonoids, vitamins B1 and B6 and folic acid, taken for 12 months. The effect cannot be credited to phosphatidylserine alone.
Phosphatidylserine containing omega-3 fatty acids may improve memory abilities in non-demented elderly with memory complaints: a double-blind placebo-controlled trial
Dementia and geriatric cognitive disorders (2010) · Rct · n=157
157 participants were randomized to receive either PS-DHA or placebo for 15 weeks.
Phosphatidylserine for the Treatment of Pediatric Attention-Deficit/Hyperactivity Disorder: A Systematic Review and Meta-Analysis
Journal of alternative and complementary medicine (2021) · Meta analysis · n=216
Four studies met the inclusion criteria for the narrative review (n = 344) and three for the meta-analysis (n = 216).
The dose points come from one randomised, double-blind trial of 78 Japanese adults aged 50 to 69 with memory complaints (PMID 21103034), who took 100 mg or 300 mg a day of soy-derived phosphatidylserine or placebo for 6 months. Test scores rose similarly in all groups, placebo included, so neither dose is shown to beat placebo. Memory scores rose from baseline on both doses only in people with low baseline scores, a within-group result. No side effects and no change in blood markers were seen, which is why the ceiling is 300 mg. The PS-DHA memory trial (PMID 20523044, 157 older adults) states no dose, the 190-person trial in mild cognitive impairment (PMID 39317299) gave 63 mg inside a multi-ingredient capsule, and the pooled 200 to 300 mg effect on inattention (PMID 33539192) is in children with ADHD, so none of them can sit on this curve.
AI-estimated from published studies. Interpret as directional guidance.
Phosphatidylserine has a higher evidence score (6/10 vs 5.5/10) and wins in 2 of 3 categories.
For pms relief, Calcium has a higher relevance score (88 vs 65).
Calcium and Phosphatidylserine may work well together: Phosphatidylserine and calcium interact at the membrane level to support cell signaling. The combination may enhance neuromuscular function and osteoblast activity. No significant pharmacokinetic interference has been documented. These can be taken together without timing concerns. The combination may be particularly useful for athletes seeking both cognitive support and musculoskeletal recovery.
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The right pick depends on your goals. Answer a few quick questions for a personalised recommendation — or dig into the full evidence on each.