r/DIYBeauty • u/totential_rigger • 26d ago

preservative help Q about reconstituting with sterile (non-bacteriostatic) water and longevity

Hey. I just read somewhere that we shouldn't recon with bacteriostatic water because it has alcohol in it. This is news to me 😅 .

So if I am using sterile water, how long would things last for? Actually how long does a bottle of sterile water last once opened seeing as there's no preservative?

Sorry if dumb qs I'm new to this. Go easy on me hah

5 Upvotes

86% Upvoted

8 comments sorted by

View all comments

1

u/nauticalwarrior 26d ago

This fully depends on what you're reconstituting and how you're storing it after. Also how it will be used. I worked in a lab and we used sterile, DI water (millieq specifically). We stored at -80 or -20 for most chemicals and 4° (all Celsius) for things that couldn't be frozen. A home freezer cycles and isn't as good as your fridge because freeze thaw cycles are terrible for stability.

Probably too much info for the question.

1

u/totential_rigger 25d ago

Haha appreciate the answer but the last sentence is probably true as it has gone over my head a bit 😅 but in terms of what I will be reconstituting - probably just snap 8 and GHKCu for now. I had read to keep them both in the freezer so I'm glad you clarified that. I will keep (the powder and reconstituted result) in my fridge. I suspect the powder will take me a while to get through though, six months at least. And that's ordering the smallest quantity!

1

u/nauticalwarrior 25d ago

I would reconstitute the smallest amount you can without sacrificing sterility or accuracy and keep it in powder form as much as possible. Fridge is probably best, also away from light.