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These neurotransmitters play a significant role in mood regulation

Effect of Vitamin D3 Supplementation in the First 2 Years of Life on Psychiatric Symptoms at Ages 6 to 8 Years: A Randomized Clinical Trial

They don't compete or interact negatively

"The effects of vitamin B12 supplementation in pregnancy and postpartum on growth and neurodevelopment in early childhood: Study Protocol for a Randomized Placebo Controlled Trial"

Arthritis Cortisone injections are a common treatment for easing pain and stiffness caused by arthritis [6-7]