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Head-to-head evidence comparison — which supplement is right for you?
Calcium vs L-Lysine: Calcium has the stronger overall evidence (8 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.
Calcium wins 2 of 3 categories. Both are solid choices — the best pick depends on your specific goals.
Verdict
Likely helps
13 of 15 studies with measurable effects showed benefit.
Top outcomes
Verdict
Likely helps
6 of 8 studies with measurable effects showed benefit.
Top outcomes
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)
and 7 more not shown
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).
The right pick depends on your goals. Answer a few quick questions for a personalised recommendation — or dig into the full evidence on each.