The dark winter months, in particular, put a strain on our bodies: the damp, cold, and gloomy weather, combined with the lack of sunshine, puts a strain on our immune system. It is precisely during these times that it is crucial to supply our immune system with all the necessary nutrients it needs to function properly. Vitamin D plays a vital role here, as it contributes to the normal function of the immune system. Vitamin D influences both the acquired (specific) and innate (non-specific) immune systems. When the vitamin is present in sufficient quantities in the body, it can support the bodys natural defenses. Furthermore, vitamin D contributes to the maintenance of normal bones, normal calcium absorption, and normal muscle function. Doppelherz Pure Drops are ideal for anyone who has difficulty swallowing tablets. The drops are of natural origin and contain no gelatin or fillers. They are also lactose- and gluten-free, making them suitable for vegetarians. Application For increased vitamin D requirements, put 4 drops on a spoon once a day and take. Alternatively, the drops can be added to some liquid and then ingested. Warning Not suitable for children under 12 years of age and pregnant women.