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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
6 of 8 studies with measurable effects showed benefit.
Top outcomes
Shared outcomes (1)
Outcomes where both Calcium and L-Lysine 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
500-3000mg daily; higher for active outbreaks
Empty stomach for better absorption, Divided doses throughout day, Away from high-arginine foods
L-Lysine HCl (capsules or powder)
Combined lysine and calcium supplementation improves calcium retention and may reduce urinary calcium loss. Studies suggest lysine co-administration increases intestinal calcium absorption and reduces calcium excretion, potentially beneficial for osteoporosis prevention.
Lysine (500–1000 mg/day) can be taken concurrently with calcium to enhance absorption and retention. Particularly useful in individuals with low bone density or recurrent calcium kidney stones (where lysine reduces urinary calcium).
6-24 months
12-36 months
Throughout pregnancy
Within days of starting
2-4 weeks prevention; acute treatment faster
4-8 weeks
Ongoing
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
The Impact of Amino Acids on Postprandial Glucose and Insulin Kinetics in Humans: A Quantitative Overview
Nutrients (2020) · Systematic review · n=55
Oral ingestion of most individual AAs induced an insulin response, but did not alter glucose concentrations in healthy participants.
Nutraceuticals and phytoceuticals in the treatment of schizophrenia: a systematic review and network meta-analysis "Nutra NMA SCZ"
Molecular psychiatry (2025) · Meta analysis · n=50
Change (Standardized Mean Difference = SMD) in total symptomatology and acceptability (Risk Ratio = RR) were co-primary outcomes.
A Dietary Supplement in the Management of Patients with Lumbar Osteochondrosis: A Randomized, Double-Blinded, Placebo-Controlled Study
Nutrients (2024) · Rct
Despite no significance regarding the distribution of Pfirrmann grade changes (improvement, no change, worsening; p = 0.259), in the supplement group, one patient achieved a three-grade improvement, and worsening of Pfirrmann grades were only detected in the placebo group (9.1%).
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.
Safety profile based on systematic review of 71 studies (n=2619). Risk analysis showed no statistically significant increase in GI symptoms (RR 1.02, 95% CI 0.96-1.07, p=0.49). Adverse events were mainly subjective GI symptoms. Short-term use up to 6g appears safe.
AI-estimated from published studies. Interpret as directional guidance.
Calcium has a higher evidence score (8/10 vs 5.5/10) and wins in 2 of 3 categories.
For bone health, Calcium has a higher relevance score (95 vs 65).
Calcium and L-Lysine may work well together: Combined lysine and calcium supplementation improves calcium retention and may reduce urinary calcium loss. Studies suggest lysine co-administration increases intestinal calcium absorption and reduces calcium excretion, potentially beneficial for osteoporosis prevention. Lysine (500–1000 mg/day) can be taken concurrently with calcium to enhance absorption and retention. Particularly useful in individuals with low bone density or recurrent calcium kidney stones (where lysine reduces urinary calcium).