Amazon also has B-12 patches you can stick on for time release action thru the day.
Gene, the B12 shots have never given me any side effects other than they hype me up big time, like 40 cups of coffee hyped up. Get lots of stuff done in the first 36 hours. 😆 Then it wears off. I’m told the type of B12 shot makes a difference but I don’t know the difference between shots.
this looks like a good site and form to buy. Methyl B12 is the best form
https://perniciousanemia.org/b12/injections/buy/
they sell it powdered in a vial then you buy saline and syringes.
Cool re patches. Did you happen to notice if your BP was elevated?