Free · Lead guide
The Peptide Starter Guide
Where to start, what to ignore, and how to read a COA, straight to your inbox.
- 01The fundamentals
- 02The COA cheat sheet
- 03The kit math
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////// The toolkit
Show me the math.
Free tools for skeptical buyers: run the kit-vs-vial numbers, count the vials a protocol takes, vet a vendor, and get the Starter Guide.
Tool · Cost-per-mg calculator
Kit vs. single vial
What a vial and a milligram really cost when you buy the kit instead of one vial at a time.
- Kit · per vial
- $30.00
- Kit · per mg
- $3.00
- Single · per mg
- $5.00
- You save
- 40%
A reference, not a rule. Prices vary by compound, so the math won't fit every case. Use it to spot who's overcharging for a legit product, and who's selling you filler.
Tool · Protocol calculator
The whole protocol, in vials.
Put in your own numbers and we do the arithmetic. We don't do the prescribing.
Dose unit
U-100 syringe · 100 IU = 1 mL
- Total needed
- 84 mg
- Vials needed
- 9
- Kits
- 1
- Each vial lasts
- ~10 days
84 doses
6 mg left over
1 spare vial
10 doses per vial
Kit route$3001 kit
Singles$4509 vials
Math only, not dosing advice. Check your protocol with a qualified professional.
Tool · Reconstitution calculator
What to draw to.
Vial strength and water in, syringe units out. The number you actually need at the bench.
Dose unit
Syringe
One millilitre per 10 mg keeps it simple: 10 units = 1 mg.
Draw to
50units · 1 mL barrel
- Concentration
- 10 mg/mL
- Volume
- 0.05 mL
- Doses per vial
- 20
- Best fit
- 0.3 mL
Arithmetic only — mass divided by volume. Not a dose, and not advice.
Download · Checklist
Vendor Vetting Checklist
Five red flags to spot before you buy. The full checklist adds seven questions to ask any vendor.
-
No batch-specific COA
- The vendor creates the batch, not the manufacturer — they buy a lot, pull one vial, test it, and that result becomes the batch’s COA.
- So one vial is speaking for the whole shipment. If half of it came back bunk, a single test cannot see that.
- What you are really judging is consistency — clean results batch after batch, not one good certificate.
- Check the batch number on the COA against the number on the vial that actually arrived.
-
COA from an unnamed lab
- The lab should be named, and the name should lead to a real company you can contact.
- Many labs have a verification page — enter the report number and it confirms what they issued. Strongest check you have.
- An AI can spot numbers that do not add up, but it cannot tell you a document is genuine. A careful fake passes.
- Going quiet once your questions get specific is the flag — not the first slow reply.
-
Purity claims with no HPLC or MS data
- HPLC tells you how much — the fraction of the sample that is actually the peptide. That is where “99%” should come from.
- Mass spec tells you what — that the molecular weight matches the peptide on the label.
- You need both. Pure is not the same as correct, and correct is not the same as pure.
- A number in a table with no chromatogram behind it is a claim, not a result.
-
No way to ask questions
- You are not testing their patience. You are testing whether someone who understands the product exists on the other end.
- “I don’t know, let me find out” followed by a real answer is a good sign.
- A fast, confident, vague answer is worse than a slow honest one.
- Slow can just be a small operation. Evasive is the problem — especially going quiet when the questions get specific.
-
Prices too good to be true
- The weakest signal on this list, which is why it is last.
- Lower can be completely honest: no packaging, no influencer budget, testing only what needs testing, buying in volume.
- Cheap is not the flag. Cheap plus the other four looking shaky is the flag.
- By this point you should already know the answers to 01–04. Let those decide, not the number.
Community
Real questions. Real receipts.
AMAs, reviews, transparency reports, and a room full of people who read the COA before they buy.
Join the community →