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The clinical and metabolic effects of rapid weight loss in obese pet cats and the influence of supplemental oral Lcarnitine. Journal of veterinary internal medicine 14.6 (2000): 598-608

The production of structural gene products, including as calcium-binding proteins and other extracellular matrix proteins (such as enamels, amelogenins, dentin sialoglycoproteins, and dentin phosphoproteins), can be induced by vitamin D through the upregulation of VDR which enable the formation of dentin and enamel (143, 147)

10.1046/j.1469-8137.2003.00813.x 65 HallJ

However, until larger controlled studies show measurable and reproducible improvements in fertility, I do not feel that these supplements are worth the money or the risk of potentially negative side effects