Yes, in fact, vitamin B12 exists in four chemical forms that are very similar
Even though vitamin B12 is water soluble, tissue half-life (how long it stays in the body) averages 13 days in healthy cats and is reduced to approximately 5 days in cats with gastrointestinal diseases or poor overall health
DSIP is a nonapeptide with the sequence Trp-Ala-Gly-Gly-Asp-Ala-Ser-Gly-Glu, molecular formula CHNO, and a molecular weight of 848.81 Da
Efficacy for most claimed uses : Gut healing, tendon repair, nerve regenerationnone of these common use cases have human trial data
Subcutaneous injections On the 10th of March 2023 I also sent Jane the following Query answer report Alternatives to intramuscular administration of hydroxocobalamin from the West Midlands Medicines Information Service March 2020 (144230-vitamin-b12-west-midlands-ukmi-march-2020-1586185691)
They do this to make sure you dont have a bad reaction