A tremendous amount of money can be saved by preparing one’s own injectables, and the process actually can be quite simple. Potential problems include availability and uncertainty as to the legitimacy of the product. On the other hand, these can be just as much or more of an issue with prepared vials or ampules. I can’t really much address the issue of whether a given powder is good or not.
If it is, then all that needs to be done is to dissolve the powder into a suitable carrier oil and usually a solubility enhancer as well, filter it, and dispense it into a sterile vial. Optionally, a bacteriostatic agent can be included.
So, how to do this?
First, let’s do the calculations needed. You’ll decide on what concentration you want to achieve. I don’t recommend aiming for higher concentrations than used pharmaceutically. So for example, with testosterone enanthate aim for 200 mg/mL, for testosterone cypionate 250 mg/mL, for testosterone propionate 100 mg/mL, for drostanolone propionate (Masteron) 100 mg/mL, for methenolone enanthate(Primobolan) 100 mg/mL, etc.
Other non-pharmaceutical examples would include drostanolone enthanthate at 200 mg/mL, Trenbolone Acetate Revalor at 75 mg/mL, and increase muscle growth powder Trenbolone Enanthate at 200 mg/mL.
It’s not that higher concentrations cannot be used, but doing so often requires using relatively large amounts of benzyl alcohol, which is irritating to muscle. Higher concentrations also may make the injection more viscous, or may result in a painful injection. The product is in no practical sense more “potent” by making it a concentration such as 300 mg/mL or above.
So let’s say you’ve decided on x mg/mL and you’re going to use y grams of steroid powder. Doing calculations with letters can seem bothersome or a put-off, but doing so lets us work with any case. For example, let’s say you’ve decided on 200 mg/mL and you have 10 grams of powder. The volume in mL of injectable you prepare is then 1000 times y divided by x, which in this case is 1000 times 10 divided by 200, which works out to 50 mL.
This volume will include everything: the powder, the solubility enhancer which typically will be benzyl benzoate, the oil, and optionally the bacteriostatic agent, which would be benzyl alcohol if used.
The amount of volume taken up by the dissolved powder varies, but it’s close enough to assume that it will take up a volume in mL of about 0.9 times y, the gram weight of powder. So in this example, it would take up about 9 mL (0.9 times 10.)
The easiest thing to do regarding the amount of solubility enhancer is to simply make it 20% of the final total volume. As an example, in the above case of 50 mL total volume, we’d use 10 mL of benzyl benzoate as the solubility enhancer. Now in many instances, a solubility enhancer is not necessary. Here, I’m keeping to a simple general formula. Where the steroid can still be fully dissolved without benzyl benzoate, the omission provides a slightly less viscous product. It’s up to you in those cases.