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Head-to-head evidence comparison — which supplement is right for you?
Calcium wins 2 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
Likely helps
5 of 5 studies with measurable effects showed benefit.
Top outcomes
Shared outcomes (1)
Outcomes where both Calcium and Digestive Enzymes 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
1-2 capsules with meals (varies by product)
At beginning of meals or just before eating
Broad-spectrum enzyme blend capsules
Digestive enzymes with phytase activity can meaningfully improve calcium absorption from plant-based diets by reducing phytate-calcium binding. General proteolytic activity also improves food matrix calcium release.
Digestive enzymes can be taken with calcium-containing meals to improve overall mineral bioavailability. Particularly useful for vegetarians/vegans with high phytate intake who rely on dietary calcium.
6-24 months
12-36 months
Throughout pregnancy
Within days of starting
Immediate
Immediate
Immediate
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
Efficacy of pancreatic enzyme replacement therapy in chronic pancreatitis: systematic review and meta-analysis
Gut (2017) · Meta analysis · n=511
PERT improved CFA compared with baseline (83.7±6.0 vs 63.1±15.0, p<0.00001; I2=89%) and placebo (83.2±5.5 vs 67.4±7.0, p=0.0001; I2=86%).
Complementary and Alternative Medicine for Autism - A Systematic Review
Journal of autism and developmental disorders (2025) · Systematic review · n=39
The results of this systematic review identified that for autistic people, vitamin and mineral supplements may only be of benefit if there is a deficiency.
Comprehensive Nutritional and Dietary Intervention for Autism Spectrum Disorder-A Randomized, Controlled 12-Month Trial
Nutrients (2018) · Rct · n=67
There was a significant improvement in nonverbal intellectual ability in the treatment group compared to the non-treatment group (+6.7 ± 11 IQ points vs. -0.6 ± 11 IQ points, p = 0.009) based on a blinded clinical assessment.
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 6/10) and wins in 2 of 3 categories.
For improve digestion, Digestive Enzymes has a higher relevance score (95 vs 30).
Calcium and Digestive Enzymes may work well together: Digestive enzymes with phytase activity can meaningfully improve calcium absorption from plant-based diets by reducing phytate-calcium binding. General proteolytic activity also improves food matrix calcium release. Digestive enzymes can be taken with calcium-containing meals to improve overall mineral bioavailability. Particularly useful for vegetarians/vegans with high phytate intake who rely on dietary calcium.