b12 horse injection Macrofol- Injectable Vitamin & Folic Acid for Horses while adult horses can easily consume one full tube on the back of their tongue Injections for Horses | VetShopMax

The science of B12 Clinically essential and widely studied: Vitamin B12 plays a vital role in red blood cell formation, neurological function, and mitochondrial energy production

Prevalence of the metabolic syndrome among Omani adults

Injection dosages are usually around 1,000 mcg while oral supplement dosages can range from 50 to 5,000 mcg

Safety and tolerability of the hexadecapeptide AOD9604 in humans. J Endocrinol Metab 3(12):715

If you bought it from a UK supplier then it's much more likely that your they have had them stored at room temperature for days/weeks/months

Without enough B12, this process slows downleading to fatigue, sluggish metabolism, and difficulty losing weight