Vitamin D3 – also now available to take as drops: Our vitamin D3, proven for many years, is now available in a practical liquid form, making them even easier to take. As a single drop already contains the recommended daily dosage of 25 µg (= 1000 I.U.), taking multiple drops is a thing of the past. Thanks to their sunflower oil content, Biogena Vitamin D3 Tropfen have a pleasantly neutral taste and do not contain medium-chain triglycerides from palm oil.