Neither coriander (dhania) water nor Brazil nuts can bring down a significantly elevated TSH. A very high TSH means your thyroid gland isn't producing enough hormone on its own, and the only treatment that directly corrects that is thyroid hormone replacement (levothyroxine) at the right dose — no food or home remedy supplies thyroid hormone itself.

Why these two specifically keep coming up

  • Brazil nuts are genuinely linked to thyroid health, but indirectly — they're one of the richest natural sources of selenium, a mineral your thyroid gland needs to convert and regulate thyroid hormone, and selenium deficiency can worsen autoimmune thyroid conditions. That's a real, if narrow, connection — but having adequate selenium is about supporting normal thyroid function, not about correcting a thyroid that's already failing to produce enough hormone, which is what a very high TSH signals.
  • Eating too many Brazil nuts isn't harmless either. Selenium has a narrow safe range, and consistently eating large quantities can push intake into excess, which carries its own risks. It isn't a "more is better" situation.
  • Coriander water has no established clinical evidence for any direct effect on thyroid hormone levels or TSH. Its popularity as a home remedy doesn't correspond to anything demonstrated in thyroid treatment.

What a very high TSH actually needs

  • Levothyroxine, at a dose your doctor sets and adjusts based on follow-up TSH results, usually rechecked 6 to 8 weeks after starting or changing the dose
  • Consistent daily timing — typically on an empty stomach, with a gap before food, coffee, calcium or iron supplements, since all of these can interfere with absorption and make an adequate dose behave like an inadequate one
  • Addressing the underlying cause where relevant (autoimmune thyroiditis is the most common cause of an underactive thyroid), which your doctor will usually have already worked through as part of diagnosis

Where diet does have a legitimate, smaller role

  • A generally balanced diet with adequate iodine and selenium supports normal thyroid function in people whose thyroid is otherwise healthy
  • For someone already on thyroid medicine, diet doesn't replace the medicine, but avoiding known absorption interferers (taking the tablet with milk, calcium, or iron at the same time, for instance) genuinely affects how well a correct dose actually works
  • If a very high TSH is left untreated while relying on home remedies, the risk isn't just that symptoms continue — in pregnancy or while trying to conceive, an inadequately treated thyroid carries recognised risks that make timely correction more urgent, not less

Selenium-rich foods and a generally healthy diet support thyroid function in the background, but they don't substitute for thyroid hormone replacement once your TSH is significantly elevated. The sooner an adequate dose is started and the dose-adjustment process begins, the sooner you're genuinely treated — home remedies in the meantime mostly cost time.

Frequently asked

Can I try coriander water or Brazil nuts alongside my prescribed thyroid medicine instead of in place of it?

A normal diet that happens to include these is fine, but don't reduce or delay a prescribed dose based on the idea that they're doing part of the job — they aren't. Any dose changes should go through your doctor based on your TSH results, not dietary additions.

How many Brazil nuts would even be "too many"?

There's no single number that applies to everyone, which is exactly why relying on it as a thyroid strategy is unreliable — if selenium intake is a genuine concern for you, that's worth discussing with your doctor rather than self-dosing with nuts.

Will my TSH come down on its own if I just wait and eat well?

A very high TSH from an underactive thyroid doesn't generally self-correct with diet alone. Some causes of thyroid dysfunction are transient (certain forms of thyroiditis, for example), but that's determined by your doctor based on your specific case, not assumed by waiting it out at home.

I also have raised anti-TPO antibodies — does that change this?

Not for the role of coriander water or Brazil nuts specifically, but positive antibodies are worth understanding in their own right — see our guide on anti-TPO antibodies high with normal or high TSH for what that result does and doesn't change.

Is it worth getting a selenium level checked?

If your doctor has a specific reason to suspect deficiency or you're being treated for autoimmune thyroid disease where selenium status is sometimes considered, it can be a reasonable test to discuss — but it isn't a routine substitute for treating an elevated TSH itself.