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Your body might not be absorbing the vitamin at a steady rate when you are taking supplements, and thats where a Vitamin B12 shot can help accelerate the process

(PubMed) Fowler AA, 3 rd , Syed AA, Knowlson S, et al

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Currently NAC has the most evidence of having a beneficial effect as an adjuvant agent in the negative symptoms of schizophrenia, severe autism, depression, and obsessive compulsive and related disorders.[xiii] For example a large RCT of 140 participants observed significant improvements on global symptomatology, and general and negative symptoms of schizophrenia in the NAC supplementation (2 g/d