TSH

Nutrients connected to TSH

A link means the body needs the nutrient for this, or that low intake is linked to it. It does not mean extra supplements help if your intake is already adequate; each link shows how strong the evidence is.

• BladderwrackDocumented risk

  In a 4-week trial in 36 healthy adults, kelp capsules raised TSH; the EU also notes higher-than-recommended bladderwrack intake can change TSH levels.

• IodineDeficiency link

  Thyroid function is checked with blood tests such as TSH; both iodine deficiency and excess can change thyroid function. TSH does not measure iodine intake itself.

• AshwagandhaPreliminary or mixed

  One pilot trial reported changed TSH, T3 and T4 in subclinical hypothyroidism; case reports show low TSH and thyrotoxicosis after use. Anyone on thyroid medicine should ask a prescriber.

• Ashwagandha TeaDocumented risk

  Thyrotoxicosis cases showed low TSH; ashwagandha may raise thyroxine on tests (MSK, case reports).

• KombuPreliminary or mixed

  In a small before-after study of habitual seaweed eaters, TSH fell after they stopped seaweed. Changes were within normal ranges in other studies.

• DulsePreliminary or mixed

  In Norwegian regular seaweed eaters TSH fell when seaweed was stopped for six weeks. A small non-randomized study; it does not show harm for any one person.

• Sea LettucePreliminary or mixed

  In 49 regular seaweed eaters (species not named), TSH fell after six weeks without seaweed. This is not specific to this seaweed and is not proof of harm.

• Ao-nori (Green Laver)Preliminary or mixed

  In 49 regular seaweed eaters (species not named), TSH fell after six weeks without seaweed. This is not specific to this seaweed and is not proof of harm.

• Hair, Skin and Nails FormulasDocumented risk

  Biotin is a recognized source of interference in thyroid immunoassays, and a case report describes a falsely high TSH picture.

• SeleniumPreliminary or mixed

  In Hashimoto thyroiditis without thyroid hormone treatment, selenium supplements lowered TSH modestly in a meta-analysis (moderate certainty). This is a lab marker, not a symptom outcome.

• AramePreliminary or mixed

  TSH fell in habitual seaweed eaters who stopped seaweed; arame was not named in the abstract.

• HijikiPreliminary or mixed

  In 49 Norwegian habitual seaweed eaters, TSH fell after six weeks without seaweed. The abstract did not name hijiki.

• MozukuDocumented risk

  Seaweed iodine can shift thyroid tests in some people; no mozuku data. Ask a clinician if you have thyroid disease.

• Sea Moss (Eucheuma & Gracilaria)Documented risk

  Excess iodine can change thyroid function and so thyroid tests; this is a risk, not a benefit.

• FucoidanDocumented risk

  Iodine from kelp-derived products can shift thyroid tests.

• Dashi (Kombu Stock)Preliminary or mixed

  Habitual seaweed intake in general changed TSH in a small study; not tested for dashi.

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