My son has not been feeling well and he said he thought it could be the iron. He had just change the iron formulation to get more. When I asked him when he was taking it, he told me at night with the ldn. Well over the past two days, he stopped the iron and ....vivid dreams... so I was wondering if iron inhibits LDN absorption. He's going to take iron at another time of day, and we'll see what happens.