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Head-to-head evidence comparison — which supplement is right for you?
Calcium vs Digestive Enzymes: Calcium has the stronger overall evidence (5.5 vs 4.5/10); 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.
Calcium 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
1-2 capsules with meals (varies by product) (the one cited trial used 2 capsules a day)
At beginning of meals or just before eating
Broad-spectrum enzyme blend capsules
and 7 more not shown
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
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.
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
A systematic review of 39 clinical trials of complementary and alternative medicine in autism, published from June 2013 to March 2023.
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.
Calcium has a higher evidence score (5.5/10 vs 4.5/10) and wins in 2 of 3 categories.
For improve digestion, Digestive Enzymes has a higher relevance score (50 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.
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.
Probiotics vs prebiotics vs synbiotics, the CFU myth, and what actually helps bloating.
The right pick depends on your goals. Answer a few quick questions for a personalised recommendation — or dig into the full evidence on each.