TUK may have this paper but if not it is useful for filing as information on the effects of various supplements/drugs on TSH levels and how this interaction may affect diagnosis.
Clinical Endocrinology (2015) 82, 136–141 doi: 10.1111/cen.12559
Drugs that interact with levothyroxine: an observational study from the Thyroid Epidemiology, Audit and Research Study (TEARS)
Savannah A. Irving, Thenmalar Vadiveloo and Graham P. Leese