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While the precise relevance of this species-specific behavior for OCD is unclear and its predictive validity may be limited, these results may be interpreted as supportive of the idea that modulators of glutamate neurotransmission can affect repetitive behaviors

85,87 In a study of Dutch community-dwelling geriatric outpatients, after adjustment for gender and age, statistically significant negative associations were found between use of metformin and vitamin D status, with those non-supplement users of vitamin D having levels of the vitamin 14.4% lower compared to controls

While some research suggests that B12 levels may influence fat metabolism and body composition, the relationship isnt fully understood

Lancet 392, 17891858