Iodine is one of the micronutrients the body cannot make on its own — it must come from diet or supplementation. Yet a significant share of the European population does not meet daily iodine needs, particularly people living far from coastal areas or those who eat little seafood or iodised salt. This moderate but chronic shortfall can affect the thyroid gland, which uses iodine as the raw material for synthesising the T3 (triiodothyronine) and T4 (thyroxine) hormones — hormones involved in regulating basal metabolism, thermoregulation, brain development and many other essential physiological functions. A regular, well-controlled iodine intake is therefore a fundamental pillar of general wellbeing.

Several forms of iodine exist in food supplements: elemental iodine, iodine from algae (kelp, fucus), or potassium iodide. Among these, potassium iodide stands out for its remarkable chemical stability and high bioavailability — the form the body assimilates most naturally, since it matches the mineral compound the thyroid gland can use directly. Unlike algae-derived iodine sources, whose content can vary considerably from batch to batch depending on harvest conditions, potassium iodide offers a precise, repeatable dose in every capsule. This consistency matters particularly for iodine, a nutrient where both excess and deficiency can affect hormonal balance — the 150 µg dose per capsule covers exactly the recommended daily intake with no risk of overdosing.

The thyroid gland, at the base of the neck, captures circulating iodine from the blood to synthesise the T3 and T4 hormones. These hormones act as genuine metabolic regulators, influencing how quickly the body burns calories, body temperature, heart rate and how nutrients are converted into energy. Insufficient iodine intake can slow hormone production, with potential knock-on effects on vitality, weight management and mood. The pituitary gland continuously monitors thyroid hormone levels and adjusts its TSH (thyroid-stimulating hormone) output accordingly — when iodine intake is regular and sufficient, this regulatory axis runs smoothly, supporting hormonal balance favourable to everyday wellbeing. That’s why a 150 µg dose is considered the optimal balance point for most adults.

Beyond its thyroid role, iodine actively contributes to the maintenance of normal cognitive function. Thyroid hormones directly influence the maturation and function of the central nervous system, and an adequate iodine intake supports attention, working memory, mental clarity and psychological balance — functions called upon every day. This neuroprotective role is particularly relevant with age or during periods of intense mental workload. For people whose diet is low in natural iodine sources (fish, seafood, iodised salt), potassium iodide supplementation offers a simple, reliable way to support these brain functions over the long term. Iodine also contributes to the maintenance of normal skin and to normal energy metabolism.

Take 1 capsule a day with a meal and a large glass of water. The course can be maintained over several months for a continuous iodine intake; each 60-capsule bottle represents a two-month course. There’s no need to exceed one capsule a day, as this already covers 100% of recommended intake — for prolonged use, medical advice can help check thyroid balance.

Do not exceed the recommended daily dose. This food supplement should not replace a varied, balanced diet and a healthy lifestyle. Not recommended for people with thyroid dysfunction (hyperthyroidism) without prior medical advice. Not recommended for pregnant or breastfeeding women without consulting a healthcare professional. Do not combine with another iodine-containing supplement without medical advice. Keep out of reach of children. Store in a cool, dry place away from light.

Who should take an iodine supplement?

Iodine supplementation is mainly relevant for people whose diet is low in natural iodine sources — those who eat little fish, seafood or iodised salt. Vegetarians and vegans are also concerned, as are people living far from coastal areas. A thyroid check-up with a healthcare professional can help determine whether additional iodine intake is right for you.

Can potassium iodide be combined with other supplements?

Potassium iodide combines well with selenium, zinc and vitamin B12, all of which support healthy thyroid function and energy metabolism. However, it is not recommended to combine this supplement with another product containing iodine (algae, kelp, fucus) without medical advice, to avoid an excessive intake that could disrupt hormonal balance.

What is the difference between algae iodine and potassium iodide?

Iodine from algae (kelp, fucus) has a variable content from batch to batch, making dosing less precise. Potassium iodide offers an exact, repeatable dose (150 µg per capsule), superior chemical stability and high bioavailability — consistency that matters particularly for iodine, where both excess and deficiency can affect the thyroid.

Where can I buy potassium iodide in Paris?

You’ll find Dynveo Potassium Iodide, 60 capsules, at Herba Barona, your specialist supplement shop at 10 rue Théophile Roussel, Paris 12. We stock the full Dynveo range with personalised advice. The shop is accessible by metro (Ledru-Rollin or Bastille) and open Tuesday to Saturday, 9:30 am to 6:30 pm.

Herba Barona is an independent specialist supplement shop in the heart of Paris — established in 2006. What you order is genuinely on our shelves: we ship from our own stock, with no dropshipping and no long waits.

Visit us at 10 rue Théophile Roussel, Paris 12 — or use Click & Collect and pick up your order in-store. We also deliver across France and Europe. Friendly, expert advice in English from our team.

Where is the shop?

Herba Barona is at 10 rue Théophile Roussel, 75012 Paris — a two-minute walk from Ledru-Rollin (line 8), close to Bastille. Open Tuesday to Saturday, 9:30 am–6:30 pm.

Can I order online or collect in store?

Yes. We ship across France and Europe under the same conditions as our French store, or choose Click & Collect to pick up your order for free at our Paris shop.