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Johns Wort can accelerate clearance and diminish efficacy, whereas inhibitors like ketoconazole, clarithromycin, certain protease inhibitors, or excessive grapefruit intake may elevate serum estradiol and increase adverse-event risk

Oral Supplementation Studies suggest that about 56% of an oral B12 supplement is absorbed, but this is largely dependent on the capacity of intrinsic factor (a glycoprotein released by the stomach that is needed for B12 absorption)

When the body is under significant physical stress, it can enter a "survival mode," suppressing the production of reproductive hormones

Copper complexes as therapeutic agents