Yes, OXYTOCIN is a Scrabble word!

Letter values in Scrabble US: O 1, X 8, Y 4, T 1, O 1, C 3, I 1, N 1.

Is it a valid word?

OXYTOCIN is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

hormone secreted by the posterior pituitary gland (trade name Pitocin); stimulates contractions of the uterus and ejection of milk

Not playable in Scrabble US: PITOCIN.