Here's a case where they're pretty sure it was all the vitamins and supplements in collagen capsules that the patient consumed for years https://n.neurology.org

Here's a case where they're pretty sure it was all the vitamins and supplements in collagen capsules that the patient consumed for years https://n.neurology.org/content/98/18_Supplement/3654 https://n.neurology.org/content/98/18_Supplement/3654