Response from BLL - IMO very informative. As I said before, I love learning and never settle for answers that are "should be" "probably ok" and the likes.
Here is the response:
Thank you for the thoughtful question, and we’re glad to hear you’ve been pleased with the product.
The two concepts are actually measuring different things. Stability in a vial refers to how well the reconstituted peptide maintains its chemical and physical integrity while being stored. Temperature, time, pH, light, oxidation, and other factors can contribute to degradation, which is why refrigeration is recommended after reconstitution.
A half-life in the body, on the other hand, describes how quickly a compound is cleared or metabolized after it enters a biological system. The environment inside the body is very different from a vial sitting at room temperature. Protein binding, including albumin binding, can affect distribution and can protect a compound from rapid clearance or degradation, thereby extending its circulating half-life.
So, a compound can require refrigerated storage after reconstitution while still having a comparatively long biological half-life at body temperature. The storage-stability timeframe and biological half-life are not directly interchangeable.
Because our products are sold strictly for research use only, we aren't able to provide guidance regarding human administration or individual use. However, I hope this helps clarify the distinction between storage stability and biological half-life.