L-Lysine
Competes with arginine to suppress cold sore outbreaks while supporting collagen synthesis, immune function, and calcium absorption.
L-Lysine is an essential amino acid that must be obtained from diet or supplements. It's a key building block for collagen synthesis and plays important roles in immune function, calcium absorption, and hormone production. Lysine is best known for its ability to prevent and reduce cold sore outbreaks by competing with arginine, which HSV needs to replicate. It's often deficient in vegetarian diets as grains are low in lysine.
Competes with arginine to inhibit HSV
Essential for collagen production
Enhances calcium uptake
How L-Lysine works — from molecular targets to health outcomes. Click an edge to see supporting research.This visualization is in beta — pathways are being refined and expanded.
500-3000mg daily; higher for active outbreaks
Loading: For active cold sores: 3000-6000mg/day in divided doses
Can be taken without food
| Form | Type |
|---|---|
| 💊L-Lysine HCl (capsules or powder) | Recommended |
| 💊L-Lysine tablets | Alternative |
L-Lysine HCl is standard and well-absorbed. Available as powder, capsules, or tablets.
Minimum: 4 weeks
Optimal: 12 weeks
Cycling: Not required
Note: Best absorbed on empty stomach. Reduce arginine-rich foods (nuts, chocolate, seeds) during outbreaks.
Reduced frequency and severity of outbreaks
Supports skin, bone, and tissue health
General immune function support
Well-studied for HSV prevention; effective at 1-3g/day
May need supplementation as grains are low in lysine
May enhance calcium absorption
Tip: Take with food if needed; reduce dose
Tip: Reduce dose
Top studies from 40+ peer-reviewed papers
Hou XW et al. • Investigative ophthalmology & visual science (2021)
“This review summarizes potential biomarkers and metabolic pathways, providing insights into new pathogenic pathways for this microvascular complication of diabetes.”
Sloun BV et al. • Nutrients (2020)
“The extracted information is publicly available and can serve multiple purposes such as computational modeling.”
Fornaro M et al. • Molecular psychiatry (2025)
“The Author(s), under exclusive licence to Springer Nature Limited.”
Hullar MA et al. • The American journal of clinical nutrition (2025)
“In healthy humans, diet impacts microbial metabolism and enzymatic activity but not the overall diversity of the gut microbiome.”
Laky B et al. • Nutrients (2024)
“In conclusion, this multi-nutrient supplement might not only stabilize the progression of lumbar osteochondrosis, but it might also potentially even increase IVD volumes as detected on MRIs.”
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