** Shares of organic and natural products company Hain Celestial Group HAIN.O tumble ~19% to $1.0099

** Company posts an adjusted loss of 3 cents per share for Q2, swinging from a profit of 8 cents a year ago

** Q2 net sales fall to $384.1 million from $411.5 million last year

** Margins primarily took a hit as rising costs, weak volumes and poor fixed-cost absorption bite, the co says

** YTD, the stock has fallen ~7%, including session moves

(Reporting by Krisha Bhatt in Bengaluru)

((Krisha.Bhatt@thomsonreuters.com;))