They do not. Do you have some sort of documentation that you could point to that indicates this is the case? Have you had this happen to yourself personally? If so what worsened before improving?
Totally anecdotal, but I have a B12 deficiency that is managed through intramuscular injections. I did not experience worsening of symptoms at the start of my treatment/supplementation. This in and of itself is enough to prove your statement false, but it is possible that I am just an exception to a general rule.
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