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Specialty Research

Melanocortin, senolytic and neuro-targeted research compounds.

Specialty research compounds cover the receptor families that fall outside the metabolic, regenerative and growth-factor groupings: melanocortin receptor ligands, neuropeptides and nootropic-class sequences, and targeted constructs studied in narrow model systems.

Every compound here is supplied for in vitro and preclinical laboratory research only. None is approved for human or veterinary use, and none may be administered.

Specialty Research research compounds

Melanocortin receptor ligands

Melanotan II is a cyclic lactam analog of alpha-MSH with broad activity across melanocortin receptor subtypes, while PT-141 (bremelanotide) is its metabolite with a comparatively MC4R-weighted profile. Because they are structurally close, receptor-subtype selectivity — not simple binding affinity — is the meaningful distinction in research design.

Cyclic peptides in this family are conformationally constrained, which makes them chromatographically distinctive and generally more stable than their linear counterparts.

Neuropeptides and nootropic-class sequences

Semax and selank are short synthetic sequences derived respectively from ACTH(4-10) and tuftsin, studied in neurotrophic-factor expression and neurochemical models. Both are short, highly soluble and early-eluting. Dihexa is a very different construct — an angiotensin IV analog studied in hepatocyte-growth-factor and synaptogenesis models, and considerably more lipophilic.

Solubility varies sharply across this group. Lipophilic constructs may require a co-solvent step before aqueous dilution, and the co-solvent then has to be accounted for as a vehicle control in any cell-based assay.

Handling and identity

Several compounds in this category are photosensitive; amber vials or foil-wrapped storage are standard once material is in solution. Cyclic and constrained peptides can also show unexpected retention behaviour, so purity methods are developed per sequence rather than applied generically.

Specialty Research — frequently asked questions

What is the difference between PT-141 and melanotan II?

PT-141 (bremelanotide) is a metabolite of melanotan II with a comparatively MC4R-weighted receptor profile, while melanotan II shows broader activity across melanocortin receptor subtypes. Both are supplied strictly as research chemicals.

Are semax and selank related?

Only by research context. Semax derives from an ACTH(4-10) fragment and selank derives from tuftsin. They are structurally distinct sequences studied in overlapping neurochemical model systems.

Why do some specialty peptides need a co-solvent?

Lipophilic constructs such as dihexa dissolve poorly in purely aqueous diluent. A small co-solvent volume is used first, then aqueous dilution, and the co-solvent is carried through as a vehicle control in cell-based work.

Are these compounds legal to purchase?

They are supplied as laboratory research chemicals to qualified professionals and institutions. Buyers are responsible for compliance with the laws and institutional policies applicable in their jurisdiction, and for handling material as research use only.

Related research categories

All compounds listed on this page are supplied for laboratory research use only. They are not drugs, supplements or cosmetics, and are not intended for human or veterinary consumption. See our research use policy.

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Related categories, stacks and documentation

Compare specialty research against adjacent research categories, or read the analytical and policy documentation that applies to every lot.