The HCl salt is more stable. In solution only the pH counts and any experiment with amino acids uses a buffer (in most cases).

Hi Gunes-Helene, we use the monohydrate for reducing media and indicate only this compound in our recipes. The main reason is the price. The monohydrate is about ten-times cheaper than the water-free compound.

Hi!

Thank you all very much for your answers! It helped a lot in choosing the right reducing agent. And I will keep in mind the effect of the HCL salt on the ph of my media and adjust accordingly.

Thank you again :)

Günes-Hélène