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4 Vitamin B3 Vitamin B3, commonly known as niacin, is predominantly found in meats, cereals, dairy products, fish, and eggs, and the recommended daily intake for niacin ranges from 15 mg/day to 20 mg/day for humans ( Niacin is crucial for the biochemistry of the nervous system, playing a significant role in energy metabolism, antioxidant activities, and the synthesis of essential molecules for neuronal function, such as acting in dopamine synthesis ( Nicotinamide adenine dinucleotide (NAD) is a co-substrate for various enzymes, such as sirtuins, polymerases, and cyclic ADP-ribose synthesis ( Niacin also contributes to the synthesis of neurotransmitters, such as serotonin, a derivative of tryptophan, which is pivotal for mood regulation and various neurological functions, such as sleep and appetite, besides impacting cognitive and executive functions (50)

Somatostatin receptors and disease: role of receptor subtypes

But there are problems with so-called specificity, meaning there are other reasons values can be abnormal, like diminished kidney function in the case of MMA, and folate deficiency in the case of homocysteine

Vitamin B12 is a key nutrient for those that need it