Thanks. I did not know it would last so long. So if I got a kit of ten vials off one of the more popular retailers on here it would be good for that long? The factory made stuff that you see advertised seems to be with quite short use by dates and I did no know about underground stuff, if maybe it was safer to hold it only for a short time.
What you say sounds a practical approach with such long use by dates. Is there any reason you suggest test C over test E?
When it comes to making experiments, how long before I should discard unused home brew if using standard BA quantities?
Pharmaceutical shelf lives are not determined by the actual longevity of the product, but by how long the manufacturer is willing to guarantee potency. This is, with a few exceptions, an arbitrary amount of time, based on commercial considerations, not scientific ones. If the manufacturer sets a one year expiration date, they merely have to demonstrate to the FDA that under the recommended storage conditions, it will retain potency and safety for one year. If it lasts 30 years, as many drugs do, they're under no obligation to offer a longer expiration date.
Experience has long demonstrated that properly made steroids remain safe and with a minuscule amount of potency loss for at least 5 years, and almost certainly much longer. The rubber stopper life is the limiting factor in such long term storage conditions.
The guidance for multi dose vials is to discard 30 days after first puncture. This assumes worst case scenario, ie, failure to sterilize the stopper top before each use, and a hospital environment high in germs. Personally I'd be fine going at least three months. possibly even the entire 6, as many do, given the basic precautions to maintain sterility are taken.
Test C and E are for all TRT intents interchangeable. Test E raw ingredients have had manufacturing issues that frequently lead to injection site pain, that C doesn't suffer from. There is simply no good reason, imo, to choose E over C.
If you make homebrew properly, it will have a shelf life effectively equivalent to UGL and pharma testosterone, which is nearly indefinite.
I'm not trying to instill fear in you, but the window for buying steroid oils is closing. It will certainly return, but if you intended on doing this any time soon, I wouldn't let any grass grow under my feet. Even if you order today, it will likely be weeks before you get it in any case.