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Lysine – Functions, Sources & Deficiency

Lysine is an essential amino acid that the body cannot produce on its own and must obtain through diet. It plays a key role in protein synthesis, collagen formation, and immune function.

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Things worth knowing about "Lysine"

Lysine is an essential amino acid that the body cannot produce on its own and must obtain through diet. It plays a key role in protein synthesis, collagen formation, and immune function.

What is Lysine?

Lysine (also known as L-lysine) is an essential amino acid, meaning the human body cannot synthesize it and must obtain it through food or supplements every day. It is one of the 20 proteinogenic amino acids and serves as a critical building block for numerous physiological processes.

Biological Functions

Lysine plays diverse and important roles in the human body:

Protein synthesis: Lysine is an essential component for the production of body proteins, including enzymes, antibodies, and structural proteins.
Collagen synthesis: Together with vitamin C, lysine is involved in the formation and stabilization of collagen, the primary structural protein found in skin, bones, tendons, and cartilage.
Carnitine production: Lysine is a precursor to carnitine, a molecule essential for transporting fatty acids into the mitochondria for energy production.
Calcium absorption: Lysine supports the absorption of calcium in the intestine and may contribute to bone strength and density.
Immune function: Lysine plays a role in the production of antibodies and in supporting overall immune defense.
Antiviral properties: Evidence suggests that lysine may inhibit the replication of the herpes simplex virus by competing with the amino acid arginine, which the virus requires for its reproduction.

Dietary Sources

Lysine is found in high amounts primarily in animal-based foods, but is also present in some plant-based foods:

Animal sources: Meat (especially beef and pork), poultry, fish, eggs, milk, and dairy products such as cheese and yogurt
Plant-based sources: Legumes (lentils, chickpeas, beans), tofu and other soy products, quinoa, pumpkin seeds

Vegans and vegetarians in particular should pay attention to adequate lysine intake, as plant-based foods generally contain lower amounts of lysine than animal-based foods.

Recommended Daily Intake

The World Health Organization (WHO) recommends a daily lysine intake of approximately 30 mg per kilogram of body weight for adults. For a person weighing 70 kg, this amounts to around 2,100 mg (2.1 g) per day. Requirements may be higher for pregnant women, athletes, and people recovering from illness or injury.

Lysine Deficiency

Causes

Lysine deficiency is uncommon in people following a balanced diet. At-risk groups include:

Vegans and vegetarians with a limited dietary variety
People in developing countries with predominantly grain-based diets (grains are low in lysine)
Individuals with increased requirements (e.g., athletes, pregnant women, the elderly)

Symptoms of Deficiency

Fatigue and reduced physical performance
Impaired growth (in children)
Weakened immune defenses and frequent infections
Hair loss
Poor wound healing
Anemia
Bone loss due to reduced calcium absorption

Lysine as a Dietary Supplement

Lysine is widely available as L-lysine in the form of capsules, tablets, or powder. It is commonly used for:

Recurring herpes labialis (cold sores) outbreaks
Supporting collagen production and wound healing
Athletic performance and muscle recovery
Vegan diets to meet daily amino acid requirements

Typical supplementation doses range from 500 mg to 3,000 mg per day, depending on the intended use. For herpes management, doses of 1,000–3,000 mg daily are often recommended.

Safety and Interactions

Lysine is generally considered safe when taken orally in usual amounts. However, high doses may cause gastrointestinal side effects such as nausea, stomach cramps, or diarrhea. People with the rare metabolic disorder hyperlysinemia should avoid lysine supplements. Since lysine may enhance calcium absorption, individuals taking calcium supplements should consult a healthcare professional before combining them.

References

World Health Organization (WHO) / Food and Agriculture Organization (FAO): Protein and Amino Acid Requirements in Human Nutrition. WHO Technical Report Series, No. 935. Geneva, 2007.
Flodin NW. The metabolic roles, pharmacology, and toxicology of lysine. J Am Coll Nutr. 1997;16(1):7-21. PubMed PMID: 9013434.
Tomblin FA Jr, Lucas KH. Lysine for management of herpes labialis. Am J Health Syst Pharm. 2001;58(4):298-300. PubMed PMID: 11227974.

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