This poll is meant to be a sibling poll to Poll: Which methyl-B12 sublingual brands have you tried and found effective. With the original poll alone, we can't see the difference between a brand that hasn't been tried versus a brand that has been tried and found to be ineffective (or less effective than the current gold standard). So I think there could be some utility in having the negative version of the poll: what brands are ineffective. There has been some discussion about whether Jarrow has changed and is now less effective, see Jarrow-- did it change?. In this poll, mark Jarrow as being ineffective even if it used to be effective for you, but isn't any longer.