Two routine tasks in a research laboratory are easily blurred: preparing an in-vitro dilution and receiving a consignment into stores. The first involves a calculator, a diluent volume and a graduated scale. The second involves a delivery note, a stock record and a batch document. The U-100 and U-50 options on the Research Sciences reconstitution calculator belong entirely to the first task. Treating them as anything other than a calculator reference — particularly when a batch is being booked into stores — creates a confusion that is straightforward to avoid and considerably harder to unpick later.
What the U-100 and U-50 Options Actually Do Inside the Research Calculator
The free reconstitution calculator described on Research Sciences product pages and in the site FAQs is a laboratory aid. It accepts inputs in milligrams, micrograms and millilitres, and it offers U-100 and U-50 syringe scales alongside optional IU conversions where a conversion factor is genuinely known. In practice, this means the calculator can take a stated diluent volume and express the resulting concentration in terms of graduations on a particular scale, so that a researcher working at the bench can align a planned in-vitro dilution with the markings already printed on the measuring equipment in front of them.
That is the whole of the feature’s remit. U-100 and U-50 are graduation conventions, not units of substance, not stock codes, and not descriptors of what sits inside a vial. When the calculator asks for a scale, it is asking which set of markings the researcher intends to read a volume against during an in-vitro procedure. The output is a working figure for that procedure — diluent volume, resulting concentration and the corresponding graduation — recorded so the assay can be repeated identically next week.
The optional IU conversion field deserves particular care. It functions only when a conversion factor is known and documented for the material in question; without that factor, the field should be left alone. Researchers should also remember that the calculator, like every item on the site, sits inside a research-use-only framework. The shop’s stated position is that its materials are labelled For Research Use Only – Not for Human Consumption, in line with MHRA guidance, and that it does not provide therapeutic, medical, performance, injection, ingestion or dosing guidance. The calculator must never be used for human or veterinary dosing, the materials themselves are not for human or veterinary use, and orders that appear inconsistent with the shop’s compliance standards may be refused.
Used correctly, the calculator supports good laboratory practice: allow the vial and diluent to reach ambient temperature before reconstitution in a research setting, note the exact volume added, and keep the calculation sheet with the assay record. Nothing in that workflow requires the scale reference to travel any further than the bench.
Booking a Batch Into Stores: What the Intake Record Should Actually Capture
Receiving goods is a documentation exercise, and the fields that matter are fixed. A stores record should capture the product name, the SKU, the quantity received, the label reference in the supplier’s format — the vial label combines the SKU code with an expiry date, for example BPC10-03/27 — the Internal Test Reference where one is stated, the associated Certificate of Analysis, the storage location and the condition on arrival. That label reference is the string to quote when contacting the shop about documentation, and it is the anchor point for everything that follows.
Scale references do not belong in any of those fields. A U-100 or U-50 figure is not a stock unit, so it cannot be used to count, split or reconcile inventory. It is not an identity marker, so it cannot help verify what a vial contains. It is not a quality marker, so it has no bearing on whether a batch should be accepted. Nor should pack appearance be pressed into that role: vial cap colours and other packaging details may vary, and cap colour is not an indicator of identity, analytical quality or manufacturing origin.
Materials managers reviewing the current catalogue before a booking is finalised will usually want to confirm each line against its own product page and batch documentation. The live research range is listed in full on the all-products page, where researchers can Buy peptides alongside laboratory accessories and preparation tools, and every entry should then be checked against the CoA supplied with the specific batch rather than against a general description.
Storage decisions are made at the same moment as the booking, and they follow the shop’s published handling guidance rather than any calculation. Lyophilised materials are held at −20°C or below, sealed with desiccant, protected from moisture, heat and light, with repeated freeze–thaw cycles avoided. Where a vial has been reconstituted for an in-vitro experiment, it is less stable and should be kept at 2–8°C for short-term laboratory use only. Record the storage position at intake so nobody has to reconstruct it later from memory.
Keeping the Reference Chain Straight: CoA, ITR and the Calculator Sheet
Two documents exist in parallel, and the simplest discipline is to keep them apart. The calculator sheet records what was done at the bench: diluent volume, scale convention, resulting concentration and the assay it supported. The batch file records what was received: SKU, label reference, ITR, CoA and storage position. Neither document should be used to fill gaps in the other.
Within the batch file, the CoA is the document researchers should actually open. Research Sciences describes certificates of analysis as accompanying its products, with HPLC testing for purity and identity, and the homepage lists CoAs Janoshik Analytical Reports. Purity figures quoted across the site — including the headline claims of ≥99% verified purity and materials described as over 99.1% pure — are the shop’s current published wording and should be reconfirmed on the live site and, above all, against the CoA that accompanies the batch in hand. The site also describes a broader testing framework covering identity, heavy metals and endotoxin evaluation of submitted samples; researchers should read whatever the batch CoA states rather than assume a result.
The Internal Test Reference needs the same restraint. Restocked products may carry the same ITR as earlier stock, and an ITR links to associated sample testing reports; it does not confirm that separate deliveries come from the same production lot or that separate independent testing has taken place. Booking a batch in is therefore a matter of recording what the paperwork says, not of inferring more than it does.
Finally, intake should hand over cleanly to safe working practice. The purchaser is responsible for lawful use, safe handling, storage and disposal, and for compliance with relevant UK regulations including COSHH and laboratory safety standards, as well as for confirming that a material suits the intended research application. Note that peptides contain trace amounts of mannitol as an excipient, and that the shop does not supply blended peptides, recommending instead that materials be bought individually and combined only within a controlled experimental design. None of that changes because a number appeared in a scale field: the calculator converts volumes; the CoA and the label reference establish what the batch is.
Gothenburg marine engineer sailing the South Pacific on a hydrogen yacht. Jonas blogs on wave-energy converters, Polynesian navigation, and minimalist coding workflows. He brews seaweed stout for crew morale and maps coral health with DIY drones.