Thyroid nutrition, evidence-based.
Short, cited, no alarmism. Every article is graded by evidence level.
Vitamin A and Thyroid: The Retinol Connection You Don't Hear About
Vitamin A and thyroid hormone share the same receptor family. See what the evidence shows about retinol, T3, and TSH in deficiency and supplementation.
Vitamin B12 and Hypothyroidism: Why Deficiency Is So Common and What to Do About It
B12 deficiency is common in Hashimoto's and hypothyroidism — often causing fatigue and brain fog that mirror thyroid symptoms. Here's why it happens and when to test.
Vitamin C and Levothyroxine: Can Acid Improve Absorption?
Vitamin C may improve levothyroxine absorption by lowering gastric pH. See what the trials show and when it actually helps.
Vitamin D and Hashimoto's: What the Evidence Actually Shows
Vitamin D and Hashimoto's: low levels are common and small RCTs show modest antibody drops, but causation is unsettled — test 25(OH)D before supplementing.
Vitamin K2 and Thyroid: Is There a Real Connection?
Vitamin K2 is sold as part of thyroid stacks alongside vitamin D. See what the evidence actually shows about K2 and thyroid function.
Zinc and Thyroid Function: What the Evidence Actually Shows
Does zinc help the thyroid? It's a cofactor for T4-to-T3 conversion, but RCT evidence is small, mostly outside Hashimoto's, and limited and inconsistent.