Questions, clearly answered.

Every order ships from within the United States.

Orders are processed within 1 to 3 business days once payment has been authorised and verified. After dispatch, domestic orders typically arrive in 2 to 5 business days and international orders in 5 to 15 business days. Those are estimates rather than guarantees - customs, weather and carrier disruption can all add time.

Yes. International delivery typically runs 5 to 15 business days, and the recipient is responsible for any customs duties or import charges that apply in their country.

Yes. A shipping confirmation email goes out when your order is dispatched, carrying the carrier name and a tracking number where the carrier provides one.

Because these are laboratory reference materials whose integrity depends on an unbroken chain of custody, delivered product cannot generally be returned. Returns are considered when the wrong product was supplied, when the product was damaged in transit, or when it arrived with a visible manufacturing defect. Contact us with your order number and photographs and we will sort it out.

Major credit and debit cards, plus the other methods shown on the checkout page.

Get in touch as quickly as you can with your order number. Orders are processed within 1 to 3 business days and cannot be changed once they have been dispatched.

Yes. Every production lot is tested by an independent ISO/IEC 17025-accredited laboratory, and each lot has its own certificate of analysis rather than a generic document reused across batches.

The lot code is printed on the vial label. Enter it in the search box on the certificates of analysis page and the matching certificate opens as a PDF. You can also browse every certificate published so far by leaving the box empty.

Purity is measured by high-performance liquid chromatography, or HPLC, which separates the target compound from related substances and reports what share of the material is the compound itself. The figure shown on a product page is the specification the compound is made to. The figure for the specific vial you receive is the one on that lot certificate.

Identity and purity. HPLC establishes purity, and mass spectrometry confirms that the molecular mass matches the compound it is supposed to be - which is how a mislabelled or substituted peptide gets caught.

Keep the sealed vial at -20 degrees Celsius, desiccated and away from light. Lyophilised powder tolerates shipping at ambient temperature without a cold chain, but it should go into the freezer when it arrives.

As a general rule, 2 to 4 weeks refrigerated at 2 to 8 degrees Celsius and protected from light. Some compounds are shorter-lived: MOTS-c carries two oxidation-prone methionine residues, and NAD+ is a dinucleotide rather than a peptide and is markedly less stable in solution. If a vial will be drawn from over several weeks, aliquot it once and freeze the aliquots rather than thawing the same vial repeatedly.

Bacteriostatic water for most work, or sterile water where a preservative is unwanted. Let the vial reach room temperature before opening it, add the diluent slowly down the inside wall rather than directly onto the powder cake, and let it dissolve on its own. Shaking a peptide solution is the fastest way to denature it.

Bacteriostatic water contains 0.9 percent benzyl alcohol as a preservative, which is what allows a vial to be entered more than once. Plain sterile water has no preservative and is single-use. Once a bacteriostatic vial has been punctured, the accepted working life is 28 days.

Because the copper is part of the molecule. GHK-Cu is a copper(II) complex of the tripeptide glycyl-histidyl-lysine, and the blue colour comes from that bound copper. A powder sold as GHK-Cu that is colourless is worth questioning.

Usually because one of them is wrong, or because the two numbers describe different forms of the same molecule - a free base and an acetate salt, for instance, which weigh different amounts per mole. Delta publishes the CAS number with the form it refers to, and flags the numbers that are commonly misprinted across this market.

It is a market nickname, not an official designation - there is no established GLP-3 receptor in the scientific literature. The compound is retatrutide, developmental code LY3437943. Delta lists it under the market name so people can find it, and uses retatrutide as the authoritative identity on the certificate of analysis.

No. TB-500 is the acetylated seven-residue fragment Ac-LKKTETQ, with a mass near 889 daltons. Full-length thymosin beta-4 is a 43-residue protein with a mass near 4963 daltons and its own CAS number. A correct TB-500 certificate shows the smaller mass. Some listings also confuse TB-500 with Ac-SDKP, which is an unrelated tetrapeptide.

No, although they are frequently sold as if they were. AOD-9604 carries a tyrosine where the fragment carries the native phenylalanine - one extra oxygen atom, a 16 dalton difference, and a different CAS number. The mass on the certificate of analysis is what separates them.

Without. The CJC-1295 in the blend is the no-DAC 29-residue peptide, also catalogued as Mod GRF (1-29): CAS 863288-34-0, molecular weight about 3367.9. CJC-1295 with DAC is a different molecule - it carries an extra C-terminal lysine bearing a maleimide group, weighs roughly 3647.2, and has its own CAS, 446262-90-4. The two get listed with each others CAS numbers constantly, so the mass on the certificate is what settles it: this one reports near 3368 daltons.

No. Everything Delta supplies is for laboratory research use only. None of it is a drug, food or cosmetic, and none of it is for human or veterinary use.

No. Delta is a supplier of research materials, not a pharmacy or a clinic, and does not publish dosing, medical or therapeutic guidance of any kind. What we do publish is identity and handling data: sequence, molecular formula, molecular weight, CAS number, solubility and storage conditions for every compound in the catalogue.

Qualified researchers, universities and laboratories. Placing an order means accepting that the material is for laboratory research use only.

In controlled laboratory environments, with each production lot then sent to an independent ISO/IEC 17025-accredited laboratory for testing before it is released.

Ask us. Send the compound, the quantity and the specification you need through the contact page and we will tell you whether we can source it.

Because none of it has been approved for human or veterinary use. These are reference materials for laboratory work, and the label states that plainly so there is no ambiguity about what is being sold.