Yes, GINSENGS is a Scrabble word!

Letter values in Scrabble US: G 2, I 1, N 1, S 1, E 1, N 1, G 2, S 1.

Is it a valid word?

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

aromatic root of ginseng plants
Chinese herb with palmately compound leaves and small greenish flowers and forked aromatic roots believed to have medicinal powers

Also: nin-sin, panax ginseng, panax schinseng, panax pseudoginseng.