The ruling on using certain foodstuffs as hair treatment

Our sister the questioner also asks and says: There are some fats or shampoos that are applied to women’s heads, and the heads are washed with them. They contain, yes, from the blessings of Allah, such as eggs and lemon, for example. What is the ruling on using them, especially since women use them and then wash them off with water inside the restrooms, where they mix with impurities? Please inform us, may Allah reward you?
Answer: There is no harm in it; we do not know of any harm in using it for the benefit of the head, the benefit of treatment. There is no objection to treating with eggs, treating with wheat, or treating with anything else. One treats with whatever has benefit. And if it is placed on the head for treatment and it has rotted, it is no longer fit for eating; it has become rotten, and there is no harm in washing it off in the bathrooms. Yes.
The presenter: May Allah reward you.