Yes, LECITHINS is a Scrabble word!

Letter values in Scrabble US: L 1, E 1, C 3, I 1, T 1, H 4, I 1, N 1, S 1.

Is it a valid word?

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

a yellow phospholipid essential for the metabolism of fats; found in egg yolk and in many plant and animal cells; used commercially as an emulsifier