A lot of people use em to get cut up. A lot of people use em as they live stressful lives. A lot of people use em as they had a history of chrons disease (me). They work great.
The dosage depends on tests results. I guess...
For me my Dr. prescribed -- 1st week/every day 1000mg; then 1shot per week for a month; and then....Well he said: "As You feel." At start I thought -- well, how the hell will I now this *feel-for-shot*, but now I just really feel.
My Dr. said to do the shots myself, but I just couldn't. I watched all the possible tutorials @youtube [and there're really good vids indeed], so I encouraged my cousine to do the shots for me.
If You have courage to do that yourself, just go for it ::]
I dunno.. :) The question I replied to must have been deleted.
I emailed Trim Nutrition a few days ago since I read here that they will ship to the UK with an email, but they haven't replied.
Oxford Biosciences is now selling methylcobalamin for injection.
B12 deficiency support group. https://www.facebook.com/groups/655423737818837/
And check out the FAQ at B12d.org