Overview
Lysine is an essential amino acid — a building block of protein the body cannot produce on its own. It is critical for normal growth, muscle turnover, and the production of carnitine, which helps the body burn fats for energy. In poultry diets, L-Lysine HCl is the workhorse limiting amino acid that determines feed efficiency and lean meat yield.
Health Benefits
- Cold sore prevention — widely used to prevent and treat cold sores caused by HSV-1 by blocking arginine, an amino acid the virus needs to replicate.
- Collagen production — essential for forming collagen, a structural protein that supports skin, bones, and connective tissues.
- Calcium absorption — helps the body absorb and retain calcium, vital for strong bones and prevention of osteoporosis.
- Anxiety reduction — research suggests it may help reduce anxiety and lower cortisol levels, particularly when paired with arginine.
Dietary Sources
- Animal products: red meat, chicken, eggs, and fish (especially cod and sardines).
- Dairy: cheese (particularly Parmesan), yogurt, and milk.
- Plant-based: soybeans (tofu/tempeh), lentils, beans, spirulina, and nuts.
Dosage & Safety
| Daily Needs | Approximately 30 mg per kg of body weight (roughly 2,100 mg for a 70 kg adult). |
|---|---|
| Side Effects | Generally safe; excessive intake (over 10 g/day) may cause nausea, stomach cramps, or diarrhea. |
| Precautions | Patients with kidney or liver disease should consult a doctor before supplementing — high doses can stress these organs. |