A separate meta-analysis that pooled results of trials in older adults with mild cognitive impairment found B-vitamin supplementation (6 to 24 months, depending on the trial) had no benefits on various cognitive parameters, including executive function, information processing speed, and episodic memory (90)
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It plays a key role in cellular metabolism and is especially popular for supporting fat loss, improving endurance, and enhancing recovery
That said, an injection is still a medical procedure
These references make clear that B12 therapy is primarily about treating deficiency, not directly burning fat
Examples include Marmite and Nutritional Yeast