doi:10.1177/003693307502000309
Summary Research suggests that certain supplements, including selenium, zinc, iron, and vitamins D and B12, may be beneficial for people with Hashimotos disease
Pantopoulos K, Porwal SK, Tartakoff A, Devireddy L
The effects are not immediate, but regular intake over several weeks can contribute to improved athletic performance, better muscle recovery, and, in some cases, a reduction in fat mass, provided it is combined with a caloric deficit and appropriate activity
Immunity Support : Glutathione enhances immune function, helping the body fend off infections and diseases
That trial did not run past 16 weeks, so it documents sustained response across that window rather than open-ended continuous use