Hi, everyone. I've already written for you once. I'm Brazilian and have B12 deficiency. There are some questions I'd like to make. I started the treament 2 months ago ( injecting 1000 mcg of cyano daily for one week) and felt really good. All the symptoms disappeared, including the neurologic. After that, as I probably need more doses for the maintenance, I got bad again. It's not too easy to take the injections like I would. Firstly, because that's very hard to find this vitamin in Brazil (here we just have cyano, all the other need to be brought from other countries). Secondly, I take it in a pharmacy, so can't take many of them because they'd not let me. Besides that, in the injection there are B6 and B1. B1 isn't a problem, but B6 can be toxic for the nerves if I take it for big periods. To fix that, I bought Jarrows sublingual methylcobalamin 1000 mcg, but it's not working. I've already taken 4 and can't feel any improvement. When I take one cyano injection I actually feel some changes in the next day. Is there any probability of sublingual not work for me or it's because of methylcobalamin doesn't work for some people cause they can't convert it? Should I buy sublingual hidroxo? Remembering that I can't find this form here in Brazil to take injections and I have ways to buy sublingual hidroxo. Will it work for me? I'm feeling bad again and need some advices to get better. Thanks all of you.