BTW, congrats on your weight loss! That's great!
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I rarely suggest what other people should do, but based on your post here and that your values were 700 in June and had dropped from 1100 in three months and you haven't taken any since, I would suggest that you begin taking your sublingual daily immediately and aim to get your B12 checked as soon as you can.
ETA: I know how difficult it can be to juggle your B12 because I have had pernicious anaemia for about 20 years - I take shots 2-4 times per week and for me it's a constant battle to keep a level over 1000! This deficiency is not something to be trifled with and I live with the consequences every day!
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I just had labs done and reveiwed with my Kaiser bariatric follow up doctor. Vitmain D should be above 80 up to a little over 100, and B12 should be over 1000. Doctor said that "health challenges (flu, other stuff) can deplete these very rapidly. Having levels of D and B12 at these numbers allows a buffer area, so when you drop, you're still within somewhat safe levels, preventing further health issues. I'd go back to whatever B12 you were taking daily to keep your levels at 1100. DAVE
Dave Chambers, 6'3" tall, 365 before RNY, 185 low, 200 currently. My profile page: product reviews, tips for your journey, hi protein snacks, hi potency delicious green tea, and personal web site.