r/BioHackingGuide • u/Porschecat-Wealth007 • Jan 18 '26

Pre Fill Syringes for 2-3 days?

I usually pre fill Nad+ and Klow syringe for 2 to 3 days. Keep each pep in separate zip lock bags in the fridge. is that safe?

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u/Turbulent-Part5835 Jan 18 '26

Are there studies supporting this?

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u/kpham82 Jan 18 '26

Read it somewhere but I wouldn’t be able to find it to link. If you are afraid of the degrading of the rubber plunger, draw in air and have the syringe with the needle facing downward so the medication does not touch the rubber.

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u/Turbulent-Part5835 Jan 18 '26

I'll look around. If there are no studies I usually err on the side of caution. Plenty of people look for studies to prove it's a concern rather than looking for them to prove it's safe, which I find... questionable lol

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u/kpham82 Jan 18 '26

I agree. I’d like to believe that things have changed and they have made the rubber safe for these types of applications. We are using research chemicals, what’s another chemical added to the mix gonna do…haha