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Head-to-head evidence comparison — which supplement is right for you?
Glycine vs Red Clover: Glycine has the stronger overall evidence (6.5 vs 4.5/10); they're alternatives for menopause support — the best pick depends on your goals. Take the 60-second quiz for a pick tailored to your goals.
Glycine wins 3 of 3 categories. Both are solid choices — the best pick depends on your specific goals.
Verdict
Too few graded studies
1 of 2 studies with measurable effects showed benefit.
Top outcomes
Verdict
Too few graded studies
1 of 2 studies with measurable effects showed benefit.
Top outcomes
Shared outcomes (1)
Outcomes where both Glycine and Red Clover have evidence — compare verdict strength side-by-side.
3g before bed (no cited trial states the dose it used)
30-60 minutes before bed
Powder (dissolves easily, tastes sweet)
40-80mg isoflavones daily
With meals, Consistent daily timing
Standardized extract (40mg isoflavones per dose)
First few nights
Next morning
Immediate
4-12 weeks
6-12 months
8-12 weeks
Ongoing
The effect of glycine administration on the characteristics of physiological systems in human adults: A systematic review
GeroScience (2024) · Systematic review
The nervous system demonstrated the most positive effects, including improved psychiatric symptoms from longer-term glycine administration in psychiatric populations.
Glutamatergic drugs for schizophrenia
The Cochrane database of systematic reviews (2006) · Meta analysis · n=358
NMDA receptor co-agonists glycine and D-serine showed some effects in reducing the negative symptoms of schizophrenia (n=132, SMD -0.66, CI -1.0 to -0.3, p=0.0004), but the magnitude of the effect was moderate.
Ingestion of a Whey Plus Collagen Protein Blend Increases Myofibrillar and Muscle Connective Protein Synthesis Rates
Medicine and science in sports and exercise (2025) · Rct · n=28
In addition, myofibrillar protein synthesis rates were higher in BLEND compared with PLA in both the rested (0.038 ± 0.008 and 0.031 ± 0.006%·h -1 , respectively; P < 0.05) and exercised (0.052 ± 0.011 and 0.039 ± 0.009%·h -1 , respectively; P < 0.01) leg.
Role of Phytoestrogen-Rich Bioactive Substances (Linum usitatissimum L., Glycine max L., Trifolium pratense L.) in Cardiovascular Disease Prevention in Postmenopausal Women: A Systematic Review and Meta-Analysis
Nutrients (2022) · Meta analysis
Meta-analysis of flaxseed, soy and red clover trials in postmenopausal women. Each plant was pooled separately.
Evaluation of Clinical Meaningfulness of Red Clover (Trifolium pratense L.) Extract to Relieve Hot Flushes and Menopausal Symptoms in Peri- and Post-Menopausal Women: A Systematic Review and Meta-Analysis of Randomized Controlled Trials
Nutrients (2021) · Meta analysis
Meta-analysis of eight randomised placebo-controlled trials (ten comparisons) of red clover isoflavones in peri- and postmenopausal women.
Isoflavone Supplements for Menopausal Women: A Systematic Review
Nutrients (2019) · Systematic review
We found that isoflavones reduce hot flashes even accounting for placebo effect, attenuate lumbar spine bone mineral density (BMD) loss, show beneficial effects on systolic blood pressure during early menopause, and improve glycemic control in vitro.
The trials behind this curve used 40 to 82 mg of isoflavones a day. A meta-analysis of five trials at that range found a marginal fall of 1.5 hot flushes a day (PMID 17239573). A second meta-analysis of eight trials found a larger effect in the subgroup taking 80 mg or more (PMID 33920485), and a meta-analysis of Promensil at 80 mg found 3.6 fewer hot flushes a day (PMID 28160855). A 6-month RCT at 80 mg improved Menopause Rating Scale scores (PMID 39254422). No cited trial reports 40 mg on its own or tested more than about 80 mg, so no threshold, optimal dose or safety ceiling is plotted.
AI-estimated from published studies. Interpret as directional guidance.
Glycine has a higher evidence score (6.5/10 vs 4.5/10) and wins in 3 of 3 categories.
For menopause support, Red Clover has a higher relevance score (70 vs 62).
No documented interaction was found in the data searched. This does not establish that this exact combination is safe.
Ashwagandha, L-theanine, magnesium, saffron — what actually helps stress, and the safety caveats.
When to take what, with or without food, and which supplements compete vs pair well.
Melatonin, magnesium, glycine, L-theanine — tiered by evidence, plus a wind-down timeline.
Hot flashes, bone, sleep, muscle — the basics that hold up vs the phytoestrogen hype.
The right pick depends on your goals. Answer a few quick questions for a personalised recommendation — or dig into the full evidence on each.