Pen vs vial — which do you prefer and why?

Update on the stall I posted about 3 weeks ago: it broke. Down 4 lbs this week after 3 weeks at the same number. Didn't change anything — just kept going. Sometimes the scale is a liar and the process is still working underneath.

The compounding question comes up a lot here. My take after 8 months: the quality varies enormously. The COA is your friend — if a vendor won't provide a third-party tested certificate of analysis, that's a red flag. I've had good results with a local 503B pharmacy that does quarterly testing.