- From sustainably harvested, wild-grown lichen- 1000iu 25g of plant source vitamin D3- Natural biologically active form of vitamin D- Vitamin D supports the normal function of the immune system and the maintenance of normal bones teethMade to the highest possible standards with simple chemical-free processes.1 Wild lichen is sustainably harvested in a clean mountainous region.2 Lichen is carefully washed clean, without the use of chemicals.3 The lichen is soaked and the Vitamin D3 oil is extracted naturally, using only pressure.4 The Vitamin D3 is then small-batch, micro-encapsulated using plant cellulose.