Essential Amino Acid

Lysine

Build collagen, suppress HSV, enhance calcium absorption, and fuel fat metabolism — the one essential amino acid your body can't make and most diets don't deliver enough of.

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Overview

L-Lysine

L-Lysine is one of nine essential amino acids that cannot be synthesized by the human body and must be supplied exogenously. It is required for collagen biosynthesis, carnitine synthesis, calcium absorption, immune globulin production, and antiviral activity against herpes simplex virus. Injectable delivery bypasses GI absorption variability to deliver consistent therapeutic plasma concentrations, particularly important in patients with malabsorption, high physiological demand, or documented deficiency.

Mechanism of Action

Lysine is an essential substrate for prolyl and lysyl hydroxylases, the enzymes that hydroxylate proline and lysine residues in procollagen chains to enable collagen cross-linking and structural stability. It is the direct precursor to carnitine biosynthesis via trimethyllysine, supporting mitochondrial long-chain fatty acid transport and ATP production. Lysine competes with arginine at the cellular uptake level via shared cationic amino acid transporters (CAT-1/CAT-2), reducing intracellular arginine availability that herpes simplex virus depends on for replication. Lysine also supports intestinal calcium absorption through calcium-binding protein upregulation and facilitates the synthesis of antibodies and hormones through its role as a limiting amino acid in protein translation.

Injection

Administered intramuscularly ensures complete absorption and immediate bioavailability.

Information presented here is for educational purposes only and not intended to replace or substitute guidance from a healthcare provider. Compounded medications are not FDA-approved nor evaluated by the FDA for safety, efficacy, or quality.

Benefits

Collagen Synthesis

Provides the obligate substrate for lysyl and prolyl hydroxylases, enabling collagen cross-linking and structural integrity in skin, tendons, ligaments, and bone.

Carnitine Production

Provides the primary carbon skeleton for carnitine biosynthesis, supporting mitochondrial fatty acid oxidation and cellular energy metabolism.

Calcium Absorption

Enhances intestinal calcium uptake through calcium-binding protein regulation, supporting bone mineral density and calcium homeostasis.

Immune Support

Required for synthesis of antibodies, enzymes, and hormones as a limiting amino acid in protein translation; competes with arginine to reduce HSV replication at the cellular level.

Suppresses HSV Replication

Lysine competes with arginine at shared CAT-1/CAT-2 transporters, reducing intracellular arginine below the threshold HSV requires for viral capsid synthesis and replication. Elevated lysine-to-arginine ratios reduce outbreak frequency and recurrence severity.

Individual results may vary. Benefits described are based on clinical and pharmacological evidence and do not constitute a guarantee of treatment outcomes. All treatment requires evaluation and approval by a licensed provider.

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Provider evaluation

A licensed medical provider reviews your intake to determine the safest, personalized treatment.

Personalized plan

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Ongoing support

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All eligibility is reviewed by a licensed medical professional

FAQs

Does Lysine require a prescription?

Yes. This is a compounded injectable preparation requiring a valid prescription from a licensed provider. Lab evaluation of amino acid levels is recommended before initiating treatment.

What are the possible side effects?

Injection site reactions including mild soreness or bruising are most common. High-dose lysine may cause nausea or GI discomfort. Excessive lysine intake may increase urinary calcium excretion and raise concerns in patients predisposed to kidney stones.

Who should not use Lysine?

Patients with lysinuric protein intolerance or hyperlysinemia should not use supplemental lysine. Patients with significant renal impairment require provider evaluation given lysine's effect on urinary calcium and amino acid excretion. Do not take if pregnant or breastfeeding.

Are there any drug interactions?

Lysine competes with arginine at shared cationic amino acid transporters; concurrent high-dose arginine supplementation may partially offset lysine's antiviral effect. Patients on calcium supplements should note lysine's calcium absorption-enhancing activity and discuss combined use with their provider.

Is Lysine safe if I have a pre-existing medical condition?

Patients with kidney disease or a history of kidney stones require provider evaluation given lysine's effect on urinary calcium. Patients with lysosomal storage disorders or urea cycle defects require specialist review before supplementation.

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The information and clinical services described on this website are for educational and informational purposes only and are not intended to diagnose, treat, cure, or prevent any disease. All treatments require evaluation and approval by a licensed healthcare provider through a telemedicine consultation. Treatment approval is not guaranteed. Individual results may vary, and treatments may carry risks and side effects. Certain compounded medications, wellness treatments, or off-label uses may not be evaluated by the U.S. Food and Drug Administration (FDA) for safety, effectiveness, or quality unless explicitly stated. Testosterone Shots provides telehealth consultations, clinical review, care coordination, lab-related services, membership services, and ongoing treatment management. Testosterone Shots is not a pharmacy and does not manufacture, compound, dispense, sell, handle, warehouse, ship, or collect payment for prescription medication. Testosterone Shots collects payment only for consultations, clinical review, care coordination, lab-related services, membership services, and other non-pharmacy services. If treatment is approved, your prescription may be sent to a licensed pharmacy partner. The pharmacy contacts you directly to complete medication payment and shipping. Services are provided by licensed physicians, nurse practitioners, and/or other licensed healthcare providers in states where they are authorized to practice. This service is not intended for medical emergencies. If you are experiencing an emergency, call 911 or seek immediate medical care. We take reasonable measures to protect personal health information in accordance with applicable privacy laws, including HIPAA. By using this website or its services, you agree to our Terms of Service, Privacy Policy, Notice of Privacy Practices, Telehealth Consent, and Important Safety Information. You must be 18 years of age or older to use this service.