are there any side effects from having b12 injections What Shots? 5 Benefits and Feeling worse after B12 Injection:

Signs of a B12 Deficiency Most often, a B12 deficiency will be identified by the presence of extreme fatigue, muscle soreness, or reduced focus and memory loss

They have demonstrated efficacy in alleviating pain associated with diabetic neuropathy, neuralgia, and low back pain, as well as promoting nerve conduction, making them beneficial for a variety of neurological and pain-related conditions

NAD+ supplementation adds NAD+ from the outside

Some research suppliers sell 5-Amino-1MQ as a lyophilized (freeze-dried) 50 mg vial

A lot will depend on the severity and longevity of your B12 deficiency as to how long before there is no further improvement or recovery

For more on this topic, read about semaglutide withdrawal symptoms and whether you can stop cold turkey