Light exposure, particularly UV light, can degrade peptides over time
Growth Hormone & IGF Research , 11(5), 266-272

PRESCRIPTIVE B12 VERSUS NON PRESCRIPTIVE B12 PRESCRIPTION B12 Hydroxocobalamin NICE-recommended form used by the NHS Prescribed by a GMC or NMC-registered medical practitioner Medical consultation required your safety is assessed first Same clinical standard as your GP Longer-lasting and more stable in the body No cyanide content Administered by a qualified medical professional using correct technique Monitored and reviewed protocol adjusted to your individual needs Private blood testing available to confirm deficiency and track response Legal, compliant and fully documented prescription NON-PRESCRIPTION B12 Often cyanocobalamin cheaper synthetic form not recommended by NICE Not prescribed no prescriber involved No medical consultation or safety assessment required Not the same standard as your GP Shorter-acting and less stable Contains a small amount of cyanide the body must detoxify Administered by non-medical staff with no clinical oversight No monitoring, no review, no adjusted protocol No blood testing deficiency not confirmed No legal prescription grey area of compliance VITAMIN B12 FAQS Vitamin B12 Injection FAQs What is the difference between hydroxocobalamin and cyanocobalamin

For comparison, see how the GLP-1 incretin axis works there are mechanistic similarities (appetite suppression, gastric emptying delay) between amylin and GLP-1, but they operate through distinct receptor systems
Notable figures in the health and fitness space have publicly discussed their experiences with BPC-157 for nerve-related issues
Lancet 382 , 507515 (2013)