Immune, Liver & Digestive Bioregulators

8 listings · 5 compounds · 275.3 to 489.5 daltons

This range holds the bioregulators assigned to thymus, liver and digestive tissue. It also holds the two shortest peptides PrymaLab stocks, and that is the first thing worth knowing about it, because a dipeptide behaves differently from a tetrapeptide in almost every way that matters to a protocol.

Specification Table

The immune, liver and digestive range at a glance

Property	Value
Listings in this range	8 across vial and metered spray
Distinct compounds	5
Mass span	275.3 to 489.5 g/mol
Smallest	Vilon, Lys-Glu, 275.3
Largest	Cardiogen, Ala-Glu-Asp-Arg, 489.5
Compounds without a Glu-Asp core	Vilon and Thymogen, the only two in the wider range
Formats	20mg lyophilised vial, or 10 to 20mg metered nasal spray
Storage	2-8°C, protected from light. Do not freeze
Page type	Category hub, not a product page
Schema page type	CollectionPage
Meta robots	index, follow
Regulatory status	No approved human formulation for any compound in this range

Why Are Vilon and Thymogen the Odd Ones Here?

Fourteen of the sixteen compounds in the Khavinson range carry Glu-Asp somewhere in the sequence. Vilon is Lys-Glu and Thymogen is Glu-Trp, so neither one does.

That matters for two practical reasons. A two-residue peptide has no internal Asp-Gly motif to rearrange, so the silent isomerisation route that complicates the tetrapeptides is closed. And at 275.3 and 333.4 daltons these are well under the rough 1,000 dalton threshold where nasal transport stops working, which is why both are offered as metered sprays rather than vials alone.

The trade is analytical. Two residues give a mass spectrum with very little to distinguish it from a contaminant of similar mass, so identity confirmation leans harder on the chromatography than it would for a longer chain.

How Do Ovagen and Livagen Differ?

Both are assigned to liver tissue and they are one residue apart in length. Ovagen is Glu-Asp-Leu at 375.4 daltons. Livagen is Lys-Glu-Asp-Ala at 461.5.

Reading them side by side shows the programme design more clearly than reading either alone. Livagen opens with lysine and closes with alanine. Ovagen drops the opening lysine and swaps the terminal residue for leucine, which is bulkier and more hydrophobic. If the tissue-assignment claim holds, two compounds this close should still behave differently in a liver assay. If it does not, they should not.

Anyone running both at matched molar concentrations is testing the central claim of the whole range, not just comparing two products.

What Should a Certificate Show for a Short Peptide?

The same fields as any peptide, with one addition. Purity by reversed-phase HPLC with the chromatogram attached rather than a bare percentage. Identity by mass spectrometry against the calculated mass, which is 275.3 for Vilon and 333.4 for Thymogen. Water content, since lyophilised material picks up moisture and a 20mg vial that has taken on water is not delivering 20mg of peptide.

The addition is the fill date for anything supplied in solution. A metered spray has been in aqueous buffer since it was filled, and elapsed time is the only practical proxy for degradation that instruments cannot see directly.

Vial or Metered Spray?

The vial gives control over concentration and a longer shelf life, at the cost of reconstitution and the arithmetic that goes with it. The spray removes the arithmetic and fixes the concentration at manufacture, which is either the point or the problem depending on the protocol.

Ovagen, Livagen and Vilon are stocked in both formats here. Thymogen and Cardiogen are vial only in this range. The wider peptide nasal spray range covers the same question across thirty-seven products if the format decision is the one being made.

Frequently Asked Questions

Compliance Statement

Every product in this range is supplied for laboratory research use only. None is a drug, a supplement or a food, none is intended for human or veterinary consumption, and none may be used for diagnostic or therapeutic purposes. No compound listed here holds an approved human formulation. Purchasers are responsible for handling these materials in an appropriate research setting and in accordance with the regulations that apply to them.