Chronic gastrointestinal diseases can also cause vomiting, diarrhea and weight loss in dogs, and may also cause the digestive system to be damaged or altered, which results in less vitamin B12 absorption
Individuals with certain health conditions, such as Lebers disease (a hereditary eye disease), should avoid B12 injections, as they can exacerbate symptoms
Some mild and short-lived side effects can include: Mild soreness or redness at the injection site A feeling of warmth after the injection A short-lived mild headache Feeling slightly flushed Serious reactions are very rare
Every other day I too was wondering whether the tiredness symptoms might be the result of something coincidental to B12 (eg, virus)
Gastrointestinal Health Due to its origin from gastric proteins, this peptide shows promise in addressing digestive system disorders