Well, that was disappointing. Though probably predictable.
When I started a year ago, 1mg/day mB12 (Readisorb) was all I needed. Then 6 months ago it stopped working as well, and I eventually found this place. Started bumping up my mB12, then adding adB12, methyl folate, LCF. Didn't feel any change from any of those, but the higher dose of mB12 (4*5mg CL) worked.
Then I got the B12 injections. I stopped taking the sublingual CL mB12 -- AND everything else -- to see how the injection did on its own. When I first started them, I didn't feel anything from the shot, but it definitely worked. I slept through the night with no symptoms and (initially) no additional sublingual B12.
So I've had no adB12/mthfolate/LCF for 2 weeks. I haven't taken mB12 in the afternoon but I've been injecting 1mg/day mB12 for 1 week, generally in the evening. The last 2-3 nights I haven't been sleeping well at all. Last night I did my injection at 11pm, and 3 hours later I was awake with the twitches -- which is about what I'd see if I wasn't taking B12 at all! And once I wake up, it generally takes 3-4 5mg CL mB12 (over the course of 2 hours or so), and often a shot or three of Readisorb, before I can finally get to sleep. I'm also getting agitation / RLS / etc in the afternoons, which had pretty much cleared up with the CL mB12.
So the injected mB12 by itself is not enough. I'm kind of surprised that the CL mB12 helps me sleep when I wake in the night -- I would have expected the injected 1mg to work at least as well as 5-10 mg sublingual. But clearly the injected needs help. (And BTW I wrapped the vial in foil as soon as I got it, and I've kept it in the fridge for the last week.)
I'm restarting adB12 (starting at 4mg) and methyl folate (~ 3mg) along with the injected, and I'll see how that works. If I have to keep supplementing the injected with as much CL mB12 as I took before, I don't see much point in the injection.
I tried doing the SC injection in a fold of belly skin, but I didn't like that much. It seemed significantly more painful than shooting in the thigh.
I noticed something interesting... my doc ordered 18ga needles for drawing, 27ga for injecting. I decided juggling 2 needles & a syringe was a PITA so I was just going to use the 27ga for draw & inject. But poking the rubber on the vial seems to *dull* the needle considerably! If I only use it to inject, it goes in pretty smoothly. If I use it to draw, I have to *PUSH* to get it in. My skin depresses significantly, and sometimes the 1 1/4" needle bends noticeably, before it finally punctures the skin! Hurts more too. I'm surprised it dulls so easily.
I'm getting some 29ga insulin syringes like Freddd and whodathunkit use. Hopefully those won't dull when I draw, and they'll be "like injecting someone else" like whoda said.