A friend has told me they are taking D3 drops daily to make up for not being outside more. I have read a little about it and it seems like a good idea. I have found some drops on Amazon that are a daily dose of 25mcg but it says they are not for under 18s. I don’t really have the money to be buying more than one so does anyone more knowledgeable than me know if this dose would be ok for a 10 year old weighing 40kg?