Two weeks trying to become a peptide reseller, and everything I got wrong

This is the post I wanted to read a month ago and could not find anywhere, because everybody in this trade writes about it after they have got good at it, once the mistakes have been quietly sanded off. So here is the unsanded version.

I wanted to buy peptides at wholesale and sell them on. Not a novel plan. The gap between what a Chinese facility charges and what a Western reseller charges is wide enough that the plan works on paper in about ten minutes. Everything after those ten minutes is where it actually lives.

Week one: finding a supplier is the easy part

I expected sourcing to be the hard bit. It is not. Getting into a supplier's Telegram group takes an afternoon. There are more facilities willing to sell you ten boxes than you would believe, and several of them are genuinely competent.

The hard bit is the second question, which is: how do I know what is in the vial.

I asked our contact for a certificate of analysis tied to the batch that would actually ship to me. Not a certificate for the compound. A certificate for the powder in my boxes. The answer came back straight away and I have quoted it on this site ever since:

We only have the COAs from the group chat. The new COAs haven't been issued yet, my dear, but the original materials we use are the same, there isn't any significant difference.

I want to be fair to her here. That is an honest answer. It is more honest than the answer most suppliers give, which is to send you a beautiful PDF instantly, for every batch, at a price that leaves no room for anyone to have tested anything. The dishonest version of this reply looks much better than the honest one, and that is the whole problem with the trade.

The first thing I got wrong: I had already published the opposite

By the time I got that answer, the catalogue was live and it said we hold a certificate of analysis against every batch. I had written it because I assumed it was true. It was not true. It was live and wrong for about a day.

I could have edited the page and said nothing. Almost nobody would have noticed. Instead I published a correction on the supply log admitting the claim had been made and was false, and left it there permanently. It is still the first thing a suspicious buyer finds when they go looking, and I now think it is the single most valuable page on the site. You cannot buy that kind of thing. You can only fail publicly and then not delete it.

The second thing I got wrong: I nearly forged a certificate

Here is the one I am least comfortable writing down.

The reference certificates we did have carried the issuing lab's watermark. My first instinct, and I want to be exact about this because I think a lot of new resellers have the same instinct and act on it, was to strip the watermark and host them as ours. It would have looked more professional. It would have taken twenty minutes.

It would also have been the end of the business, and not for moral reasons. Serious labs publish a report number lookup. Any reseller with a shred of suspicion types the number into the lab's site and gets back either a matching report or nothing. The watermark is not decoration, it is the thing that makes the document checkable, and removing it turns a verifiable document into a forgery that verifies as a forgery. The exact buyers worth having are the ones who check.

We host those certificates now, watermarks intact, labelled as manufacturer reference reports and nothing more.

The third thing I got wrong: the money

I built the price list, ran it, and shipped it. Then someone would have found this, and I would rather it was me.

Freight from China is a flat seventy dollars per order. Freight from the US warehouse is per box, on a sliding scale by volume. I applied the flat China charge as if it were a per box charge. On low volume items that seventy dollars had nowhere to hide, so it landed entirely on a single box.

The result was that KPV 5mg was priced above KPV 10mg. Half the peptide, more money. Not a clever bundling decision, just arithmetic I did not check.

The pricing script now amortises the China freight across a realistic basket and then runs an inversion check that fails the build if a bigger vial ever comes out cheaper than a smaller one of the same compound. If you are building your own price list, write that check before you need it. It costs ten lines and it catches the class of error that makes you look like you do not understand your own product.

The fourth thing I got wrong: I nearly built the thing that gets people charged

I wanted to list the GLP-1s. Semaglutide, tirzepatide, retatrutide. They are the volume, everybody knows they are the volume, and the obvious move is to leave them off the public catalogue and mention that they are available on request, direct message me.

I talked myself out of it and the reasoning is worth repeating, because "keep it off the website" feels like caution and is actually the opposite.

A public listing plus a certificate plus a private channel to close the sale is not a way of hiding the transaction. It is the exact fact pattern that appears in charging documents, and it produces the evidence rather than concealing it. Worse, approval makes it more dangerous, not less. Once a compound is approved, the patent holder has exclusivity and a commercial reason to litigate, so a copy stops being an unapproved drug and becomes patent infringement with a motivated private plaintiff attached. The window closes on approval, not before it.

Forty eight compounds came off our list for reasons like that, written down per compound so I cannot quietly forget why. Seventy seven are left. That is still a business.

The thing I got right, mostly by accident

I asked about labels almost as an afterthought, expecting to be told no. The factory prints artwork and applies it before the vials are boxed. That single answer changed the shape of the whole thing, because the constraint I had built the business around, which was selling blank vials to people who then had to label them at their kitchen table, was not a real constraint. I had just never asked.

Ask the stupid question. The supplier is not going to volunteer the capability you did not know to want.

Where I actually am

Not selling yet at the time of writing. Certificates are reference only and labelled as such. The offer is that you send any lot to any lab you like, we credit the test against your next order if it passes, and refund the box in full and pay for the test in cash if it fails. That is a worse deal for me than better looking paperwork and it is the only version I can defend when somebody asks.

If you are a fortnight into the same thing, I would like to hear which of these you also did. Especially the certificate one. I do not believe I am the only person who had that thought.