Vitamin D receptors are present in nearly every tissue in the human body.

FORBES: Vitamin D: Still More Questions Than Answers

D-serine had a "right-handed" configuration, which is almost never seen in the human body.

FORBES: Repairing The Brain

D-serine was of the "right-handed" configuration, which is almost never seen in the human body.

FORBES: Repairing The Brain