Vitamin D₃ is known to be sensitive to oxidation by air. Loss of activity is further accelerated by heat and exposure to light. Vitamin D₃ in our Hansevit^® D₃  4000 is a yellow, oily liquid. Thanks to ZMC´s unique formulation technology the tailored addition of nature-like antioxidants ensures the highest possible protection against oxidation of the active substance. Proven protection – without use of synthetic antioxidants like BHT and BHA.