L-Lysinate is lysine — an essential protein building block — in the charged, salt-forming state that lets it carry minerals such as zinc and magnesium in supplements. Sold for cold sores and for calming, it has never been compared against ordinary lysine on any health outcome. Anxiety fell mainly where diets were short of lysine, the cold-sore claim stays contested, and digestive upset caps intake near six grams daily. (Full Review)

Protocol

Standard suppression protocol

1 g three times daily

L-lysine hydrochloride with meals; 1 g daily between outbreaks

Nutritional-adequacy protocol

1 g/day

Food fortification on a plant-predominant diet

Combination stress protocol

2.64 g lysine + 2.64 g arginine daily

Stress and anxiety endpoints; no arginine restriction

Time to effect

Anxiety and stress hormones

1 week to 3 months

Window over which trial measures shifted

Cold-sore suppression

3 to 6 months

A full recurrence cycle must pass first

Benefits

High: Reduced anxiety and stress-hormone reactivity

Medium: Fewer infectious episodes where habitual lysine intake is low; adjunctive reduction in schizophrenia symptom scores

Low: Fewer and milder herpes labialis recurrences; improved calcium absorption and retention; restored protein quality on plant-predominant diets; reduced hair shedding with iron

Speculative: Collagen crosslinking and connective-tissue integrity; increased homoarginine production; inhibition of protein glycation

Contraindications

Glutaric aciduria type I, lysinuric protein intolerance or hyperlysinemia

Chronic kidney disease stage 3b or worse (below 45 mL/min/1.73 m²)

Calcium-containing kidney stones within the past five years

Symptomatic gallstone disease

Pregnancy and breastfeeding

Key Interactions

Aminoglycoside antibiotics (gentamicin) and amphotericin B: Caution

Over-the-counter non-steroidal anti-inflammatory drugs (ibuprofen): Caution

L-arginine, L-citrulline and L-ornithine supplements: Caution

Other interventions, notably arginine-restricted diets: Caution

Calcium salts and calcium-containing prescriptions (calcium carbonate): Monitor

Over-the-counter calcium carbonate antacids: Monitor

Mineral lysinate and bis-glycinate chelates (zinc lysinate): Monitor

Additive supplements that also raise calcium absorption (vitamin D3): Monitor

Aciclovir, valaciclovir and famciclovir: No known interaction

Risk & Side Effects

High: Dose-dependent gastrointestinal intolerance

Medium: Increased urinary calcium on a low-protein diet; transient insulin and glucagon release after bolus dosing

Low: Renal tubular injury; aggravation of inherited lysine-handling disorders

Speculative: Elevated alpha-aminoadipic acid; blunted arginine-dependent nitric oxide signaling; altered cholesterol handling and gallstone risk

Monitoring

Marker	Target	Why
Estimated glomerular filtration rate	Above 90 mL/min/1.73 m²	Detects tubular injury
Serum creatinine	0.6–1.0 mg/dL in women, 0.7–1.2 mg/dL in men	Filtration input; early tubular stress
24-hour urinary calcium	Below 200 mg/day in women, below 250 mg/day in men	Captures the calciuria signal
Albumin-corrected serum calcium	9.2–9.8 mg/dL	Absorption not raising blood calcium
Fasting insulin	2–5 µIU/mL	Context for post-dose hormone release
Serum ferritin	70–150 ng/mL for hair endpoints	Iron repletion precedes the hair response
Plasma lysine	150–250 µmol/L	Confirms a dietary shortfall is real

Cadence: Baseline, then kidney function and calcium at 12 weeks and every 6 to 12 months. Fasting insulin annually above 3 g/day. Endpoint reassessed at 12 weeks and 6 months.

Qualitative Assessment

Number and severity of cold-sore outbreaks per six-month window, recorded prospectively
Subjective tension and stress reactivity, scored weekly on the baseline scale
Sleep onset latency and morning refreshment, noted qualitatively
Daily hair shedding, counted on the same weekday under the same washing routine
Gastrointestinal comfort, the first thing to change if the dose is too high

L-Lysinate for Health & Longevity

Protocol

Benefits

Risk & Side Effects

Monitoring

Qualitative Assessment