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Head-to-head evidence comparison — which supplement is right for you?
Calcium vs Psyllium Husk: Psyllium Husk has the stronger overall evidence (8.5 vs 5.5/10); they're alternatives for improve digestion — the best pick depends on your goals. Take the 60-second quiz for a pick tailored to your goals.
Psyllium Husk 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
Likely helps
6 of 6 studies with measurable effects showed benefit.
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
5-10g daily
Before meals, With plenty of water
Whole husk powder
and 7 more not shown
In a small human trial, 3.4 g of psyllium taken with calcium made no significant difference to calcium absorption. That one trial does not show the effect, or its absence, at larger fibre doses.
No separation is needed at usual psyllium doses. With very large fibre doses, or while a calcium deficiency is being treated, taking them at different times is a pragmatic precaution, though no study has tested whether it helps.
6-24 months
12-36 months
Throughout pregnancy
Within days of starting
2-3 days
4-8 weeks
Immediate
First 1-2 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.
Galactomannans are the most effective soluble dietary fibers in type 2 diabetes: a systematic review and network meta-analysis
The American journal of clinical nutrition (2023) · Meta analysis · n=2685
Galactomannans had the highest effect on reducing the levels of HbA1c (SUCRA: 92.33%) and fasting blood glucose (SUCRA: 85.92%).
The Effect of Fiber Supplementation on Chronic Constipation in Adults: An Updated Systematic Review and Meta-Analysis of Randomized Controlled Trials
The American journal of clinical nutrition (2022) · Meta analysis · n=1251
Overall, 311 of 473 (66%) participants responded to fiber treatment and 134 of 329 (41%) responded to control treatment [RR: 1.48 (95% CI: 1.17, 1.88; P = 0.001); I2 = 57% (P = 0.007)], with psyllium and pectin having significant effects.
The effect of psyllium on fasting blood sugar, HbA1c, HOMA IR, and insulin control: a GRADE-assessed systematic review and meta-analysis
BMC Endocrine Disorders (2024) · Meta analysis · n=962
19 RCTs, 962 participants: FBS reduced by 6.89 mg/dL (95% CI: -10.62, -3.16).
Psyllium Husk has a higher evidence score (8.5/10 vs 5.5/10) and wins in 2 of 3 categories.
For improve digestion, Psyllium Husk has a higher relevance score (72 vs 30).
In a small human trial, 3.4 g of psyllium taken with calcium made no significant difference to calcium absorption. That one trial does not show the effect, or its absence, at larger fibre doses. No separation is needed at usual psyllium doses. With very large fibre doses, or while a calcium deficiency is being treated, taking them at different times is a pragmatic precaution, though no study has tested whether it helps. Consult a healthcare provider for personalized advice.
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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.