Yes, absolutely. Within the framework of a consumption of 10g/day, without any particular excess in proteins, there is no contraindication. Collagen can even have a favourable effect on the functioning of the thyroid and there is no interaction with Levothyrox: however, as the thyroid functions better, Levothyrox can be overdosed in certain cases. This is why, as with any intake of food supplements by people who are already taking medication, it is advisable to inform your doctor, who may, if necessary, adjust the doses of medication according to the improvement in your general condition.