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On-Label vs Off-Label and Compounded Products Vitamin B12 injections are an established medical treatment for confirmed B12 deficiency and related conditions (for example, pernicious anemia and certain malabsorption states), as summarized by the NIH Office of Dietary Supplements in its Vitamin B12 fact sheet for health professionals

Because the intranasal forms have lower absorption than the IM dosage form, intranasal B12 forms are administered once weekly

Neurological symptoms may take longer to resolveoften several weeks to monthsand improvement may be gradual rather than immediate

SLU-PP-332 is a synthetic small molecule selective PPARd (PPAR/d, NR1C2) agonist

It depends