L-Lysine
Compiled from published pharmacological and botanical literature. Not independently verified by Herbuno. Spotted an error or have a correction? Flag it below →
| Compound | L-Lysine |
|---|---|
| Chemical class | Essential α-amino acid — diaminohexanoic acid; cationic at physiological pH |
| CAS | 56-87-1 (free base) · 657-27-2 (monohydrochloride) |
| Primary source | Microbial fermentation, typically Corynebacterium glutamicum |
| Key applications | Collagen cross-linking, carnitine synthesis, calcium absorption, herpes simplex management |
| Claim strength | High for essentiality and cereal-diet limitation; Moderate for recurrent herpes simplex |
| Typical form | Crystalline hydrochloride or acetate/base at 98–99% |
| Buy from Herbuno | L-Lysine HCl · L-Lysine Acetate / Base Powder |
| Origin | Processed / Sourced from India |
| MOQ | R&D 100 g / 250 g (subject to stock) · Pilot batch 1–5 kg · Bulk 10 kg, 25 kg and above |
| Lead Time | Dispatch within 72 hrs from stock · fresh-batch production (typically 50 kg+): 10 working days |
| Documentation | CoA & MSDS standard with every lot |
Name origin: From the Greek lysis, loosening or dissolution — Edmund Drechsel obtained it in 1889 by hydrolysing casein, and named it for the method of its release rather than for any property of the molecule. Its second amino group, on the far end of the side chain, is what makes lysine chemically distinctive: it carries a positive charge, participates in cross-linking, and is the site of the Maillard reaction that dominates its formulation behaviour.
Discovery and production history: Lysine's industrial significance is agricultural before it is nutritional. It is the first limiting amino acid in cereal grains, meaning that in a diet based on wheat, rice or maize, lysine runs out before the other essentials and caps protein utilisation regardless of total intake. This made lysine supplementation central to animal feed economics, and lysine is produced by fermentation at a scale of millions of tonnes annually, overwhelmingly for livestock. Supplement-grade material is a small, more tightly specified fraction of the same industry.
Research trajectory: Two strands. The nutritional strand concerns cereal-based human diets, where lysine fortification has been trialled as a public health measure with mixed results. The clinical strand is herpes simplex: the observation that lysine antagonises arginine, which the virus requires for replication, generated a trial literature from the 1970s onward on lysine for recurrent cold sores and genital herpes. A third, smaller line examines lysine's role in collagen cross-linking via lysyl oxidase and in calcium absorption.
Commercial source: Lysine is produced by fermentation using Corynebacterium glutamicum on a carbohydrate substrate, usually corn or cane derived. It is supplied principally as the monohydrochloride, which is stable and easy to handle, and as the acetate or free base where chloride load is a concern. The substrate determines vegan, non-GMO, kosher and halal eligibility and is the documentation point most buyers are actually specifying.
Evidence for L-Lysine Applications
Lysine as the limiting amino acid in cereal diets is settled nutrition and underappreciated commercially. In a diet dominated by wheat, rice or maize, lysine is exhausted before the other essential amino acids, so additional protein from the same source cannot be utilised. This has direct relevance to largely vegetarian and cereal-based populations, including much of India, and to the growing plant-protein category in export markets, where pea protein is relatively lysine-adequate but rice and wheat proteins are not. Blending or fortifying to correct the limitation is a legitimate and well-founded formulation strategy. Claim strength: High.
The herpes evidence is modest, real, and frequently overstated in both directions. Herpes simplex replication requires arginine, and lysine competes with arginine for intestinal transport and renal reabsorption, lowering arginine availability. Trials of lysine for recurrent herpes have reported reduced recurrence frequency and shorter episode duration at doses around 1 to 3 grams daily, though results are inconsistent and several trials were small or methodologically weak. The effect, where present, is on frequency and severity rather than on eradication. It is a reasonable supportive claim at the Moderate level, not a treatment claim. Claim strength: Moderate.
Collagen biochemistry gives lysine a structural role distinct from glycine's. Lysine residues are the substrate for lysyl oxidase, the copper-dependent enzyme that forms the covalent cross-links giving mature collagen and elastin their tensile strength, and hydroxylysine residues are glycosylation sites in the collagen molecule. This is well established. As with glycine, it does not follow that supplementing lysine increases collagen cross-linking in someone with adequate protein intake, and human trials demonstrating that outcome are absent. Claim strength: High for the biochemistry, Emerging for the consumer claim.
Carnitine synthesis depends on lysine, which connects two ingredients that are usually sold separately. Carnitine is synthesised endogenously from lysine and methionine, with vitamin C, niacin, B6 and iron as cofactors. This means lysine adequacy is upstream of carnitine status, and it is one reason carnitine deficiency is uncommon in people eating adequate protein. It also means a carnitine product and a lysine product address overlapping territory, which is worth knowing when positioning either. Claim strength: High.
Calcium absorption effects are plausible and thinly evidenced. Some work has found lysine increasing intestinal calcium absorption and reducing urinary calcium excretion, generating interest in lysine as an adjunct in bone formulations. Trial evidence is limited, older, and has not been replicated at scale. A bone product combining lysine with calcium is not making an unreasonable claim, but the evidence does not support presenting lysine as an established absorption enhancer. Claim strength: Emerging.
Tolerability is good and the main caution is interactional rather than toxicological. Doses up to 3 grams daily are well tolerated; higher intakes may cause gastrointestinal upset. No tolerable upper intake level has been established. The interaction worth noting is the mirror of the herpes mechanism: because lysine and arginine compete, a high-dose lysine product will modestly reduce arginine availability, which matters if the same consumer is taking an arginine or citrulline product for vascular purposes. The two are routinely sold into the same market without anyone mentioning it. Claim strength: Moderate.
Sourcing L-lysine from Herbuno. We supply L-lysine hydrochloride and an acetate/base grade for applications where chloride load matters.
If you are formulating a plant-protein product on a rice or wheat base, lysine fortification is the single most defensible amino acid addition you can make — it corrects a real limitation rather than supplementing an adequacy. All lots ship with CoA and MSDS as standard; request a quotation for pilot or bulk volumes.
Dosage & Formulator Specification
L-lysine monohydrochloride is roughly 80% lysine by weight, so 1 gram of the salt delivers about 800 milligrams of lysine — a distinction that matters when replicating trial doses reported as lysine rather than as the salt. The acetate and free base forms carry different fractions again. Adult requirement is around 30 milligrams per kilogram daily, which a protein-adequate diet meets comfortably; the supplemental doses used for herpes are pharmacological rather than nutritional, at 1 to 3 grams of lysine daily.
For protein fortification the calculation is different and more precise. The objective is to raise the lysine content of the protein to match the reference pattern, so the inclusion depends on the base protein's existing lysine content and the target protein level in the finished product. Rice protein is substantially lysine-deficient and needs meaningful correction; pea protein is relatively adequate and needs little. This is an arithmetic exercise against the amino acid profile of the specific protein isolate, not a fixed inclusion rate.
Maillard browning is the dominant formulation constraint and it follows directly from lysine's chemistry. The free epsilon-amino group on the side chain is highly reactive with reducing sugars under heat, producing browning, off-flavours and, importantly, loss of nutritionally available lysine — the lysine is still present on assay but no longer bioavailable. This matters in bars, extruded products, baked applications and any thermally processed format containing sugars. It also proceeds slowly at ambient temperature over shelf life in high-moisture products. Lysine is freely soluble and hygroscopic, requiring moisture control in storage.
For analytical control, specify identity and assay by HPLC or ion-exchange chromatography with optical rotation confirming L-configuration, and state which salt the assay refers to. Where the product is thermally processed, consider specifying available or reactive lysine rather than total lysine, since total assay will not detect Maillard losses. Standard amino acid specifications cover heavy metals, residual solvents, microbiological limits and loss on drying, and the certificate should name the fermentation organism and substrate. Lysine is fermentation-derived rather than plant-extracted, so phytosanitary certification does not apply.
Where lysine is added to a plant-protein product rather than sold standalone, the specification conversation should start from the isolate's own amino acid profile rather than from a target lysine dose. Ask the protein supplier for a full amino acid analysis on the actual lot rather than a typical-values sheet, because plant protein profiles vary with cultivar, growing conditions and processing. The correction needed to bring a rice-protein base up to the reference pattern is substantially larger than for a pea base, and getting it right is the difference between a protein that delivers its label protein value and one that does not, whatever the nitrogen assay says.
Frequently Asked Questions — L-Lysine
Does lysine work for cold sores?
The evidence is modest but real. Herpes simplex needs arginine to replicate, and lysine competes with arginine for intestinal transport and renal reabsorption. Trials at 1 to 3 g daily have reported reduced recurrence frequency and shorter episodes, though results are inconsistent and several trials were small. It is a supportive claim at Moderate strength, not a treatment claim, and it affects frequency and severity rather than eradicating anything.
Why fortify a plant protein with lysine?
Because lysine is the first limiting amino acid in cereal grains — in a wheat, rice or maize base it runs out before the other essentials, so extra protein from the same source cannot be used. Rice protein needs meaningful correction; pea protein is relatively adequate. It is arithmetic against the isolate's amino acid profile, not a fixed inclusion rate.
What is the browning problem?
Lysine's free side-chain amino group is highly reactive with reducing sugars under heat. You get browning, off-flavours and loss of bioavailable lysine — and critically the lysine still shows on a total assay while no longer being usable. In thermally processed products consider specifying available or reactive lysine rather than total.
HCl or acetate/base?
Hydrochloride for most applications — stable, easy to handle, about 80% lysine by weight. The acetate or base grade is for formulations where chloride load matters, such as some clinical or electrolyte-sensitive products. Each carries a different lysine fraction, so state which salt the assay refers to.
Does lysine interfere with arginine products?
Yes, modestly, and it is rarely mentioned. The same competition that underlies the herpes effect means a high-dose lysine product will reduce arginine availability. If the same consumer is taking arginine or citrulline for vascular purposes, the two work against each other. Worth considering if both sit in the same product range.
Why source lysine from India?
Around 80% of raw nutraceutical ingredients originate in China and amino acids are among the most concentrated categories, so a second qualified origin is a continuity measure. For lysine specifically, the fermentation industry is mature globally because of feed demand, and India has established capacity with supplement-grade specification and certification infrastructure.