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kcryland's isoelectric point explanation is the right frame, and there is one number in it that is worth writing down because it decides most of these cases before anyone touches a filter or a buffer. Bacteriostatic water is not one pH. The USP spec for Water for Injection permits 5.0 to 7.0...

A few things in this thread are right and one is a myth worth killing, because it decides whether your powder is still good in a year. The myth: "freezer" is not a single temperature. Most modern freezers are frost-free and run an automatic defrost cycle, typically once or twice a day, where a...

Cost is the wrong variable, and I think that is why so many people stall on it. The number that matters is not your monthly spend. It is your cost per milligram, because the monthly spend only rises when you raise the dose, while the $/mg is what you can actually control. A concrete example...

Two days in, some early replies arrived by WhatsApp and DM rather than in the thread — which is fine, but it means the public numbers are thin. So let me put up something concrete first, and then ask again. What I actually found when I went looking for the same number on my own stock I pulled...