Question about needle usage

[BLASIUS]

Hi All,
in case I have to use 2 peptides at the same time from 2 different pens, can I use the same needle moving it from one pen to the other or it is better to use 2 different needles?

 

[spyke65]

Needles are designed for single use and are relatively cheap. I wouldn’t risk cross-contamination or an introduction of bacteria just to save 20¢. Also, each time a needle pierces your skin or the rubber septum, it will become duller. Dull needles do more damage to the septum and can make injections more painful.