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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.
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.