Is there a good health food store in Bangkok?

For example, somewhere to get burger mix or flax seed oil and so on?

Lemon farm

http://www.lemonfarm.com/

Branch on Chaeng watthana Rd, Pradit Manutam ("under" the Ekamai Ram Intra expressway just off Rama 9 Road) has a wide range of veggie delicacies in it's supermarket/health store. A selection of Thai handicrafts too

Seven-V Foodmart, B043 Basement Floor, Fashion Island, (66 2) 947 5119

Health foods, herbal products (shampoo, toothpaste). Sells pesticide free produce (rice vegetables and fruit). Open 10:30am-09:30pm.