Liquid Vegan Vitamin D3 by Fertile Moon is an easy-to-swallow flavorless liquid supplement formulated with strict vegetarians and vegans in mind. We source our vitamin D3 from lichen, a moss, rather than traditionally-sourced lanolin. Fertile Moon vitamin D3 is: non GMO, gluten free, vegan, dairy and soy free, and is not tested on animals. Symptoms of vitamin D deficiency include: depression, muscle pain, bone pain, tiredness, and subfertility. People at risk for vitamin D deficiency are: the elderly, overweight, and those with darker skin pigment. These statements have not been evaluated by the Federal Drug Administration.