Thanks for your input; I've been severely b-12 deficient since discovered in 2006; I can no longer absorb b-12 naturally from foods; taking by mouth has never been effective for me - but you mention a new form I've not tried and will look into. Thanks again...!! I take 1cc of cyanocobalamin injections (breaking to .5cc weekly); if the other is more effective, I'm all for it and will ask. My b-12 levels now range from 850-1300, depending on the date of the blook taken. When b-12 deficiency was discovered, I had depleted to 178...needless to say, I was falling, tripping, hurting myself,etc - not to mention what the neurological impacts were to my cognitive functioning. ..thanks again!