Reta storage temperature

That temperature is too warm. I keep reconstituted material at 34 degrees and the dry powder in the freezer at minus 12.

A normal kitchen fridge around 2-4 C is the better choice if possible. Avoiding warm spells after mixing matters more than getting it extremely cold. For use within three or four weeks the mini unit may be fine, but beyond eight weeks the colder setting helps. Reconstituted material can be frozen once with only minor loss. Dry powder is also fairly forgiving and many people simply refrigerate it. The main exception is that opened bacteriostatic water should stay at room temperature because chilling can cause separation that does not reverse on warming.

For keeping things out of sight you could try a dedicated skincare container that fits in the regular fridge. Some products are meant to be chilled anyway, so a divided case might let you store the vials underneath without drawing attention when you open it.

Peptides can sit in a cool dry spot for several months before noticeable breakdown occurs.

If the household freezer is not an option, look for compressor-style portable coolers that actually reach freezing. They are larger and louder than thermoelectric models but will get colder.

I often see people let the vial or syringe reach room temperature before injecting. Is there any real advantage, or is it just habit?

One video suggested letting frozen powder sit out for half an hour so it matches the temperature of the bacteriostatic water being added, to avoid condensation inside the vial. That step does not seem relevant once the material is already mixed and stored for weekly use.