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Read the full review Neuroscience 23 May 2026 Dihexa for OCD (Obsessive-Compulsive Disorder): The 2026 UK Review Rigorous 2026 UK review of Dihexa for obsessive-compulsive disorder (OCD)

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1,2 Serum vitamin B 12 levels may be artificially elevated in patients with alcoholism, liver disease, or cancer because of decreased hepatic clearance of transport proteins and resultant higher circulating levels of vitamin B 12

This is generally reported by a gastroenterologist or advanced endoscopist

Other NR human clinical trials also showed that NR could significantly increase the concentrations of NAD + by about 1- to 2-fold [[132], [133], [134], [135], [136], [137]] and NAD + metabolites in the blood [134,[137], [138], [139]]

The ratings range from very good to good to fair (Table 1)