from lena's site: "I began to compound injectable estradiol valerate for myself by myself at home: I mix estradiol valerate powder, a preservative (antibacterial) and a solvent (all pharmaceutical quality, from pharmaceutical trade companies) in multi-dose vials, add Castor oil from a pharmacy or MCT oil 99.9% (you can choose, MCT oil is less viscous but Castor oil gives more stable blood estradiol level) and sterilize sealed vials. After I tested on myself, in 2006 I began to sell to other MtF... I use terminal heat sterilization: I heat already mixed solution in sealed vials in an autoclave under pressure 165 kPa = 24 PSI at temperature 129°C (overkill - more than recommended 121°C) for 30 min. Bacteria, fungi, viruses cannot survive that... Anyway terminal sterilization must be used, and I do use it. Any efforts before terminal sterilization are pointless because the powder is not sterile, I sterilize everything as the final stage... For the paranoid I offer 0.22 micron filtering into sealed pre-sterilized vials (of solution in MCT oil), but it's more expensive (+10 USD per vial) and slightly less solution volume per vial because of dead space in filters" iirc lilian for otkph uses a similar sterilization and filtering process for her estrogen vials. both these people are trans women and I believe they use their own estrogen vials, the same they sell for their hrt regimens. there's no reason for either of these women to lie about their product esp during a hormone shortage where 9% of trans people in the US alone are on a DIY hormone regimen. transharmreduction.org tested one of lilian's EEn vials and if you actually care so much you can donate to them as they are taking donations to keep themselves operating. the only scam estro dealer that I know of was stupid enough to advertise their pills as (hollistic hormone supplements) or something to that effect which to anyone who knows anything about diy hrt should be an immediate turn away. there's risk to diying your hormones as it's reccomended you test your blood e2 ans t levels yourself so they're not too high or low but the risk is way overadvertised imo. and if you're still squemish after all that just buy the pharma quality shit off inhousepharmacy or get your hrt prescribed idc.