Natural Factors - L-Lysine 500mg Vegetarian - 180 Capsules

Essential Amino Acid for Immune and Tissue Health

Natural Factors L-Lysine delivers 500 mg of pure, free-form L-lysine—an essential amino acid that your body cannot produce on its own and must obtain from diet or supplementation. L-lysine plays critical roles in protein synthesis, collagen formation, calcium absorption, immune function, and the body's natural defense against viral challenges. This vegetarian-friendly formula provides therapeutic levels of L-lysine to support tissue repair, bone health, and overall wellness.

Key Benefits

• 500 mg of free-form L-lysine per capsule – Highly bioavailable form that's ready for immediate absorption and use
• Supports immune function – Helps maintain the body's natural defenses, particularly against certain viral challenges
• Promotes collagen production – Essential for healthy skin, connective tissue, and wound healing
• Enhances calcium absorption – Supports bone health and helps prevent calcium loss
• Tissue repair and recovery – Supports muscle recovery, tissue regeneration, and overall healing processes
• Vegetarian capsules – Suitable for vegetarian and vegan diets
• 180 capsules – Three-month supply for daily wellness support

Why L-Lysine Matters

L-lysine is one of nine essential amino acids that serve as the building blocks of protein in your body. Unlike non-essential amino acids that your body can synthesize, L-lysine must come from external sources. It's particularly important for the production of carnitine (which helps convert fatty acids into energy), the formation of collagen (the structural protein in skin, bones, and connective tissue), and the absorption of calcium for strong bones. L-lysine also plays a unique role in supporting the body's immune response to certain viral challenges.

Free-Form for Superior Absorption

Natural Factors uses free-form L-lysine, which means the amino acid is in its pure, unbound state—not attached to other amino acids or proteins. This free-form structure allows for rapid absorption and immediate utilization by the body, making it more effective than L-lysine bound in protein complexes. Free-form amino acids bypass the digestive breakdown process and are ready to be absorbed directly into the bloodstream.

Who It's For

L-Lysine is ideal for adults seeking immune support, particularly those prone to certain viral challenges, individuals looking to support collagen production for healthy skin and connective tissue, athletes and active individuals needing tissue repair and recovery support, or anyone wanting to enhance calcium absorption for bone health. It's also beneficial for vegetarians and vegans who may have lower dietary lysine intake.

Suggested Use

Take 1–3 capsules daily on an empty stomach with water, or as directed by a healthcare practitioner. For immune support during viral challenges, higher doses may be recommended—consult your healthcare provider. For best absorption, take between meals.

About Natural Factors

Natural Factors has been a trusted leader in science-backed nutritional supplements for over 60 years, combining rigorous quality standards with sustainably sourced ingredients. Every product is third-party tested to ensure purity, potency, and safety.

These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.