Think a Vitamin B12 injection is always better
The relative abundance of Erysipelatoclostridium was increased in vehicle-treated mice that underwent the WD to LD switch (WD/LD-V) relative to the two control groups (LD/LD-V and WD/WD-V) but was not increased in 5A-1MQ-treated mice that underwent the same diet switch (WD/LD-T)
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Suboptimal B12 causes brain fog, difficulty concentrating, mood changes, tingling extremities, and progressive neurological decline
Then, they are given monthly to keep symptoms away
Your response can depend on your nutrient levels, metabolism, health history, and the type of injection used