What it is
L-Lysine is an essential amino acid crucial for immune function and collagen formation. It is available in capsule form and is used to support the body's defense against viral infections, particularly herpes simplex virus.
Supplement · Amino Acid
L-Lysine
1000 mg · vegan · gluten-free · 100 caps
recurrent-herpes-outbreaksfrequent-infectionsslow-wound-healing immune systemlymphatic systemskin
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How it works
L-Lysine competes with arginine, an amino acid that herpes simplex virus requires for replication. By limiting arginine availability, L-Lysine can inhibit viral proliferation. It also plays a vital role in collagen synthesis, essential for tissue repair and immune cell function.
Who should take it
Adults looking to address frequent infections, low immunity, slow recovery. Particularly relevant for people who prefer a targeted single ingredient and who have ruled out an underlying condition that needs medical care first.
Avoid / careful
Pregnant or nursing women without clinician oversight. People on prescription medication affecting the same pathway should consult a doctor before combining. Side effects are uncommon at recommended doses but mild GI upset can occur when starting.
When to take it
Morning
Noon
Evening
Night
How to take it
With food
Empty stomach
Before food
FAQs
Frequently asked
How long does it take for L-Lysine to work for cold sores?
For cold sore prevention, consistent daily intake is recommended. For active outbreaks, noticeable reduction in duration and severity may occur within 3-7 days of higher dosing.
Can L-Lysine be taken with other supplements?
L-Lysine can generally be taken with other supplements, but it's advisable to consult a healthcare provider, especially if taking medications that affect amino acid metabolism.
What is the difference between L-Lysine and lysine?
L-Lysine is the biologically active form of the amino acid lysine, commonly used in supplements.
Research
6 studies · 2010–2024
Evidence grade
ABCD
B · B · emerging-to-moderate human evidence for immune resilience
From the blog
Editorial notes
SacredBod's longer take on L-Lysine — context the structured blocks above don't capture.
About L-Lysine
L-Lysine is a amino acid supplement used to support immune resilience. Essential amino acid for cold-sore suppression and collagen. It is available in capsule form and dosed for adults in India and internationally. As a western-tradition entry in the SacredBod catalog, it is positioned as a single-ingredient option that can be used on its own or layered into a broader protocol.
How it works
L-Lysine works through the mechanisms characteristic of its class — see the mechanism and research sections for detail. It primarily acts on the immune system, lymphatic system, and effects are dose-dependent, typically becoming measurable within 2-6 weeks for immune resilience. Consistency matters more than dose size for this category.
Who it’s for
Adults looking to address frequent infections, low immunity, slow recovery. Particularly relevant for people who prefer a targeted single ingredient and who have ruled out an underlying condition that needs medical care first.
Evidence
L-Lysine carries an evidence grade of B in the SacredBod catalog. Essential amino acid for cold-sore suppression and collagen. See the Research panel above for the underlying studies, participant counts and typical effect sizes.
Dosing & timing
Typical label dose is 1000 mg in capsule form. Most adults can expect noticeable effects within 2-6 weeks for immune resilience. Consistency matters more than a single large dose — take it daily and re-evaluate against your blood markers at 8–12 weeks.
Cautions
Pregnant or nursing women without clinician oversight. People on prescription medication affecting the same pathway should consult a doctor before combining. Side effects are uncommon at recommended doses but mild GI upset can occur when starting.
As part of the Amino Acid category, L-Lysine can be used on its own or layered into a broader protocol — see the Goes with panel for synergistic pairings.
Added to your stack.