@Seyma Wilschefski would you mind sharing these studies that you’re referring to because I’m not aware of a direct relationship between molybdenum and iron absorption.
Iron absorption is influenced by several factors, including the presence of other minerals and nutrients like vitamin C for example, which enhances iron absorption. But molybdenum is not typically considered a major player in this process.
Excess molybdenum induces copper deficiency in ruminant animals, and copper is involved in iron metabolism. But that has no relevance to humans because it results from byproducts produced in the rumen. Maybe that’s what these papers are referring to? But again, this is in animal studies, not humans.
What dosage is the molybdenum in your products? The Institute of Medicine set the tolerable upper intake level (TUIL) for molybdenum which is 30mcg per day per kg bodyweight. So if someone weighs 70kg, the highest safest dose is 2100mcg per day for this individual.
Most supplements often contain as little as 150mcg and rarely contain more than 1mg, so supplements used according to labeled use should be overwhelmingly safe.
You can also read more about molybdenum and its impacts HERE.