Iodine (potassium iodide)

Name: Iodine (potassium iodide)
Brand: Pure Encapsulations
SKU: product-0383
Price: 15.00 GBP
Availability: InStock
Rating: 4.8 (24 reviews)

£15.00

Potassium iodide is the most stable and bioavailable supplemental form of iodine, providing consistent dosing without the variability inherent in food-derived or seaweed-based sources
Iodine is the essential substrate for thyroid hormone synthesis — without adequate iodine, the thyroid cannot produce T4 (thyroxine) or T3 (triiodothyronine), the hormones that regulate basal metabolic rate across every organ system
Iodine contributes to normal cognitive function — the brain is particularly sensitive to thyroid hormone status, and iodine deficiency is the leading preventable cause of cognitive impairment worldwide
Iodine contributes to normal energy-yielding metabolism — thyroid hormones directly regulate the rate at which cells convert nutrients to ATP, making iodine a foundational requirement for sustained energy
Iodine supports the maintenance of normal skin through its role in cellular turnover and tissue repair processes regulated by thyroid function
The hypoallergenic Pure Encapsulations formulation ensures no interference from common allergens or unnecessary additives, making it suitable for sensitive individuals and those on elimination protocols

4.8 (24 reflections)

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Pure EncapsulationsIodine (potassium iodide)

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about this product.

A single-ingredient, hypoallergenic iodine supplement delivering 225 mcg per capsule as potassium iodide — the most reliable and consistent form of iodine available — supporting thyroid hormone production, cognitive function, energy metabolism, nervous system function, and skin health from the number one practitioner-recommended supplement brand.

Iodine is the mineral your thyroid cannot function without, and your thyroid is the gland that sets the metabolic pace for every cell in your body. It produces T3 and T4 — the hormones that regulate how fast you burn calories, how efficiently you think, how well you regulate body temperature, how quickly your hair grows, and how effectively every organ system operates. Without adequate iodine, thyroid hormone production falters, and the cascade is felt everywhere: fatigue that rest cannot fix, brain fog that makes simple tasks feel effortful, weight that creeps upward despite unchanged habits, dry skin, thinning hair, cold extremities, and a pervasive sluggishness that you attribute to ageing or stress while the real driver sits quietly in your neck, starved of its essential raw material.

The UK is one of the few developed nations without a mandatory iodine fortification programme. Unlike the US, Canada, Australia, and much of Europe — where salt is routinely iodised — British dietary iodine depends almost entirely on dairy and seafood consumption. If you eat less dairy, follow a plant-based diet, avoid seafood, or simply do not consume enough of these foods consistently, your iodine intake is likely inadequate. The National Diet and Nutrition Survey has repeatedly shown that significant portions of the UK population, particularly women of childbearing age, fall below recommended iodine levels. Seaweed-based supplements offer inconsistent and sometimes dangerously variable iodine content, with single servings of some kelp products delivering several thousand percent of the daily requirement. The gap between what most Britons consume and what their thyroid needs is one of the most underappreciated nutritional deficiencies in the country.

Pure Encapsulations Iodine delivers 225 mcg of iodine as potassium iodide — a precise, pharmaceutical-grade dose that provides 150% of the UK nutrient reference value in a form that is stable, predictable, and free from the variability of food-derived sources. The capsule contains only iodine, hypoallergenic plant fibre (cellulose), and a vegetarian capsule shell. No wheat, no gluten, no egg, no peanut, no magnesium stearate, no titanium dioxide, no artificial colours, flavours, or preservatives. Every batch is third-party tested for purity and manufactured under strict GMP conditions. From the brand recommended by more healthcare practitioners than any other supplement company.

Iodine contributes to normal cognitive function, normal energy-yielding metabolism, normal functioning of the nervous system, the maintenance of normal skin, and the normal production of thyroid hormones and normal thyroid function. 60 capsules per bottle — a two-month supply at one capsule daily.

You gain thyroid support, which removes the hormonal bottleneck created by insufficient iodine and enables normal T3 and T4 production — the hormones that regulate energy, metabolism, temperature, and cellular function throughout the body

You gain cognitive clarity, which removes the brain fog and mental sluggishness associated with suboptimal iodine status and enables sharper thinking, focus, and everyday mental performance

You gain metabolic efficiency, which removes the unexplained fatigue and weight resistance driven by underactive thyroid hormone output and enables normal energy-yielding metabolism

You gain nervous system function, which removes the impairment caused by iodine deficiency in neural signalling pathways and enables the normal functioning of the nervous system

You gain ingredient certainty, which removes the dangerous variability of seaweed and kelp-based iodine sources and enables a precise, predictable daily dose with zero risk of excessive intake

how to take it

Take one capsule daily with a meal, or as directed by your healthcare professional. Morning is ideal to align with the body's natural thyroid hormone production cycle. Do not exceed the recommended dose without medical guidance — excess iodine can suppress thyroid function in susceptible individuals, particularly those with pre-existing thyroid conditions. If you have Hashimoto's thyroiditis, Graves' disease, or any thyroid disorder, consult your doctor before supplementing with iodine. If taking thyroid medication (levothyroxine, liothyronine), consult your prescribing doctor, as iodine supplementation may alter dosing requirements. Store in a cool, dry place. Keep out of reach of children. 60 capsules — two-month supply.

ii.

The mineral your thyroid is almost certainly not getting enough of — in the only form that guarantees you know exactly how much you are taking.

frequently asked.

Who is most likely to benefit from an iodine supplement?

People who avoid dairy products, seafood, and iodised salt are most at risk of low intake. Vegans and those on restricted diets are commonly affected. A thyroid or nutritional blood panel is the most reliable way to confirm a shortfall before supplementing.

Can I take this if I already have a thyroid condition?

Not without medical guidance. Both hypothyroidism and hyperthyroidism can be sensitive to changes in iodine intake. If you have a diagnosed thyroid condition or take thyroid medication, speak with your doctor before starting this supplement.

Is it possible to take too much iodine?

Yes. Iodine has a narrow range between sufficiency and excess, and chronically high intake can paradoxically suppress thyroid function or trigger autoimmune thyroid responses in susceptible individuals. Stick to the recommended dose and avoid combining with other iodine-containing supplements unless advised by a clinician.

How long before I might notice a difference?

If low iodine has been contributing to symptoms such as fatigue or sluggish metabolism, some people notice gradual improvement over several weeks as thyroid hormone levels stabilise. Changes in blood markers are typically measurable within 4 to 8 weeks, though this varies by individual.

Why potassium iodide specifically?

Potassium iodide is a stable, inorganic salt form of iodine that is well absorbed and has been used in clinical and public health settings for decades. It is the standard form used in most well-characterised iodine supplements.

Customer reflections

Overall sentiment

4.824 reflections

1 – 6 of 24 reflections

QQVerified Buyer

The first adrenal support that made a quick difference.

4 days ago

Gentle on a sensitive stomach, and I feel like myself again. I had tried two other glandulars before this and neither sat right.

MRVerified Buyer

Steadier mornings within a fortnight.

1 week ago

I was sceptical about glandulars, but my mid-afternoon crash has genuinely eased. One capsule with breakfast and I forget about it.

ALVerified Buyer

Subtle, but real.

2 weeks ago

Not a stimulant, which is exactly what I wanted. It took about ten days, then I realised I wasn’t dreading the afternoon any more.

SKVerified Buyer

My clinician recommended it.

3 weeks ago

Bought after a blood panel flagged a flat cortisol curve. Easy to take, no jitters, and the sourcing is refreshingly transparent.

TPVerified Buyer

Recovery feels faster.

1 month ago

Training hard through a stressful stretch and this has helped me bounce back between sessions. Already on my second bottle.

DVVerified Buyer

Does what it says.

1 month ago

No frills, one ingredient, a sensible dose. I appreciate that it is designed to be used for a season rather than forever.

Iodine (potassium iodide)

about this product.

how to take it

frequently asked.

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Customer reflections