Inclusion Criteria:  Diagnosis of subclinical hypothyroidism TSH levels between 3 and 10 mIU / L Normal levels of free triiodothyronine ( T3) and free thyroxine (T4) Without previous or current treatment with levothyroxine  Exclusion Criteria:  Thyroid surgery or reception of radioactive iodine in a previous period of 12 months History of cardiovascular disease and / or thrombosis Established diagnosis or clinical suspicion of kidney or liver failure, chronic infections, blood diseases, type I diabetes and type II diabetes Drug treatments that affect thyroid function (corticosteroids, amiodarone, propranolol, lithium) Statin treatment and / or hormone replacement therapy Adjuvant treatment with trace elements, vitamins or antidepressant and antipsychotic drugs Hospitalization for serious illness or elective surgery in the past 4 weeks Diseases and / or treatments that affect intestinal absorption (proton pump inhibitors) Pregnant, planning to become pregnant or breastfeeding women Consumption of ω-3 PUFA type food supplements Intolerance and / or allergy to lactose and / or cow's milk proteins Any pathology that requires close control, advises against their participation or there is an inability to move independently Habitual residence outside the study's influence area Participation in another clinical trial with drugs, or in other experimental studies Refuse to sign the informed consent