Glycine vs Lysine for skin & hair
Short answer: For skin & hair, users rate them about the same: 100% report improvement with Glycine (12 reports) and 100% with Lysine (3 reports).
Glycine has 392 meta-analyses and 620 randomized trials on PubMed; Lysine has 180 and 469.
Based on 695 reports about Glycine and 41 about Lysine. Not medical advice.
| Glycine Supplement | Lysine Supplement | |
|---|---|---|
| Users say it helped | 70%helped299 reports · high confidence | 80%helped10 reports · few reports |
| Verdict | Mostly positive | Mostly positive |
| Research | AResearch: Strong | AResearch: Strong |
| Meta-analyses / RCTs | 392 / 620 | 180 / 469 |
| Mainly used for | ||
| Sleep % reporting improvement | 87% (255) | — |
| Anxiety % reporting improvement | 78% (60) | 100% (2) |
| Mood % reporting improvement | 87% (39) | 100% (2) |
| Energy % reporting improvement | 94% (17) | 50% (2) |
| Skin & hair % reporting improvement | 100% (12) | 100% (3) |
| Common side effects | vivid dreams, drowsiness, fatigue, brain fog | drowsiness |
| Typical dose reported | 2 g / daily | 2400mg / daily |
In studies using high-throughput metabolomics, several blood amino acids appear to be consistently associated with the risk of developing type 2 diabetes.
Diabetes Care, 2016 ↗“2 grams with 200mg magnesium before bed gives me crazy good sleep. Crazy vivid dreams.”
We estimate that developmental disorders caused by DNMs have an average prevalence of 1 in 213 to 1 in 448 births, depending on parental age. Given current global demographics, this equates to almost 400,000 children born per year.
Nature, 2017 ↗“L-lysine has worked wonders for me. It only helps if I start taking it right when I feel that slight tingling sensation... I take 2 1000mg tablets 3 times a day for 2-3 days.”
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Percentages come from first-hand user reports and are not clinical outcomes. Talk to a doctor before starting, stopping or combining anything. How we rate