Retatrutide (Reta): research reagent reference

Store sealed vials dry, dark and frozen at −20 °C or colder, moving to −50 to −80 °C for long-term storage, and let each vial reach room temperature in a desiccator before opening.^S1 Keep solutions short-lived: divide a reconstituted stock into single-use aliquots, freeze them and avoid freeze–thaw cycles. Container choice matters at low concentrations: lipidated and amphipathic peptides can adsorb to glass and some plastics, so check recovery rather than assume it.

Retatrutide is a large, lipidated peptide. Handling guides note that peptides of this kind may need gentle, unhurried mixing and, if the protocol allows, a buffer slightly above neutral pH; check the supplier's documentation for the counter-ion before calculating molar quantities.

1. Work in a clean laminar-flow or biosafety cabinet using aseptic technique, with gloves and eye protection.
2. Let the sealed vial reach room temperature in a desiccator before opening, so moisture does not condense on the powder.
3. Tap or briefly centrifuge the vial so all of the powder sits at the bottom.
4. Use the solvent your assay protocol specifies. Sterile water or a suitable buffer suits most short, charged peptides; a sequence that resists dissolving may need the small amount of dilute acetic acid or organic co-solvent described in standard peptide handling guides.^S1
5. Add the solvent slowly down the inside wall of the vial with a calibrated pipette, then swirl or roll gently until the solution is clear. Avoid vigorous shaking or vortexing, which can promote aggregation.
6. If the assay needs a sterile solution, pass it through a 0.22 µm low-protein-binding filter.
7. Label the stock with compound, solvent, date and batch number, split it into single-use aliquots, and freeze them at −20 °C or colder. Thaw one aliquot per experiment and discard what is left rather than refreezing it.

The concentration of a stock solution is set by the assay protocol, not by this page. Our guides to reconstituting peptides with bacteriostatic or sterile water and how to store peptides explain the reasoning behind each step.

Purity: not published. Titan Peptides publishes a purity figure only once a certificate of analysis (COA) for the batch has been checked and its compound name, CAS number and sequence match the product. Until that check is complete, no purity figure is shown on this page or in the catalogue.

A COA is available to account holders on request. Our guide on how to read a peptide certificate of analysis explains what to check, and HPLC and mass spectrometry for peptide purity covers how the figures are measured.

Retatrutide is not named in the Poisons Standard June 2026 (F2026L00633).³ The TGA's 13 April 2026 safety advisory nonetheless names retatrutide as an example of an unapproved peptide product, one that has not been evaluated by the TGA for safety, quality or effectiveness, and states that a "research use only" disclaimer does not make supply lawful.⁴ Retatrutide is not an approved therapeutic good in Australia or elsewhere. See research peptides and Australian law.