evidence: Vitamin D is essential for our health, supporting bones, teeth, muscles and the immune system. The most effective vitamin D form, vitamin D3, is normally sourced from sheep's wool, but Healthspan now has a Vegan Vitamin D3 product made from a low-CO2 plant source. [...] Vitamin D3 (cholecalciferol) is the form most important for human health, and is the best form to take as a supplement. Previously, Healthspan's vitamin D3 was all sourced from lanolin, which comes from sheep's wool. [...] Most vitamin D3 is produced from lanolin, which comes from wool, which comes from CO2-producing sheep