Supplement·Interactions·Reviewed June 9, 2026
L-Lysine interactions.
L-Lysine has 6 documented interactions in the NutriStack database: 1 to avoid or watch closely and 5 that work synergistically. The full list, with what each pairing does, is below.
L-Lysine at a glance.
A quick, data-grounded summary. The full table is below.
L-Lysine has 6 documented interactions in the NutriStack database: 1 to avoid or watch closely and 5 that work synergistically. The full list, with what each pairing does, is below.
Everything that interacts with l-lysine.
Every supplement and medication in the NutriStack database with a documented interaction with this substance, highest-severity first. Open any pair for the mechanism and sources.
| Substance | Interaction | What happens |
|---|---|---|
| L-Arginine | Conflict | Arginine and lysine compete for cellular uptake; high-dose arginine can reduce lysine's effect on HSV outbreak prevention. |
| Acyclovir | Synergy | L-lysine is used by some patients as adjunctive prophylaxis against herpes simplex recurrences, working by a different mechanism than acyclovir.... |
| Calcium | Synergy | L-lysine can enhance intestinal calcium absorption and reduce urinary calcium excretion, supporting calcium retention. |
| Collagen Peptides | Synergy | Lysine is a key amino acid in collagen and, in its hydroxylated form, is required for the cross-links that give collagen tensile strength,... |
| Iron | Synergy | Adding L-lysine alongside iron has been associated with improved ferritin levels in some iron-deficient individuals who do not fully respond to iron... |
| Valacyclovir | Synergy | Valacyclovir is the prodrug of acyclovir, and L-lysine prophylaxis works through a separate, arginine-competition mechanism against HSV. Evidence is... |
The full l-lysine profile.
Benefits, dosing by goal, forms, and the cited evidence for this supplement.
Common l-lysine questions.
Quick answers drawn from the table above.
What interacts with L-Lysine?
In the NutriStack database, L-Lysine has 6 documented interactions with other supplements and medications. The most notable include L-Arginine, Acyclovir, Calcium, Collagen Peptides, and Iron.
What should you not take with L-Lysine?
L-Lysine is flagged against 1 substance in the database, including L-Arginine. Review these with a clinician before combining, especially alongside prescription medications.
What works well with L-Lysine?
L-Lysine pairs synergistically with Acyclovir, Calcium, Collagen Peptides, Iron, and Valacyclovir in the NutriStack database. Synergy still depends on dose and timing; open any pair for the detail.
Can you take L-Lysine with L-Arginine?
NutriStack classifies the L-Lysine and L-Arginine pairing as conflict: Arginine and lysine compete for cellular uptake; high-dose arginine can reduce lysine's effect on HSV outbreak prevention. Separate by 2 hours and avoid high-dose arginine during active HSV outbreaks. Reduce dietary arginine sources (nuts, chocolate) when using lysine...
Check your whole stack
See how l-lysine fits your routine.
NutriStack screens your full stack for interactions and timing conflicts, and updates the moment you change it.