Sundaram RK, Bhaskar A, Vijayalingam S, Viswanathan M, Mohan R , Shanmugasundaram KR
1,25-Dihydroxyvitamin D3 restores fertility of vitamin D-deficient female rats
The ease of access is something worth mentioning too

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Why B12 matters to dogs At a cellular level, vitamin B12 performs many important functions (see here for even more nerdy details)
By stimulating the pituitary gland, CJC-1295 DAC increases the natural production of GH, leading to potential anti-aging benefits, such as improved skin elasticity and vitality