Many Anti depressants work as anti inflammatory agents.
There are other cheaper and safer ways of improving your natural anti inflammatory status and raising your 25(OH)D3 level to the natural primitive level our DNA evolved to function best with 60~80ng/ml is a good start.
The article refers to the role of the enzyme tryptophan hydroxylase 1.
and there is work showing that Vitamin D3 increases the expression of the tyrosine hydroxylase gene in adrenal medullary cells of mice. This is the mechanism thought to increase brain serotonin levels and why those with higher vitamin D levels experience less depression.
If inflammed digestive system is the underlying problem you may need to get your vitamin D3 BOTH ORALLY and through the skin. (sunlight or massage the
contents of an oil based gel cap $5 discount code WAB666 into the skin in a place not subject to exposure to light.