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In rodents at least, Pinealon administration has correlated with an improved ability to negotiate a maze,45 suggesting that the subjects could acquire and retain information more effectively

The AAFPs evidence-based clinical review states directly: Oral administration of high-dose vitamin B12 (1 to 2 mg daily) is as effective as intramuscular administration for correcting anemia and neurologic symptoms in patients with B12 deficiency (Langan RC, Goodbred AJ, American Family Physician, 2017)

While methylcobalamin may be more readily absorbed than synthetic types, research has not shown a significant difference among the various vitamin B12 types

I know some recommend just Vitamin B12 as often as every other day, because it can help stimulate the appetite