High Potency D2 & K2 Complex from Irwin Naturals provides a great way to support bone, immune and mood health. The strong formula delivers the most important bone health essentials, including vitamin D3, vitamin K2 (as MK-7), magnesium, zinc and bamboo extract, which supplies silica, an essential component of healthy bones. Vitamin D3 and zinc play critical roles in maintaining a healthy immune response. These are combined with turmeric extract and eleuthero, both known traditionally for supporting immune function. Research suggests that vitamin D3, the sunshine vitamin, may help support overall mood. The adaptogen eleuthero is also known for its traditional use in mood support.