Nettle™

Nettle™ is a breakthrough neurotechnology headband designed to relieve PMS symptoms and period pain without drugs or hormones. Using transcranial direct current stimulation (tDCS), a method backed by over 30 years of research, it delivers gentle pulses to the brain’s DLPFC and M1 regions, helping regulate mood and pain through neuroplasticity. Just 20 minutes a day during the luteal phase can significantly improve comfort and wellbeing.

In a placebo-controlled clinical trial, 77% of users reported significant pain relief, with an average 53% reduction in pain. 67% experienced improved mood with 34% fewer PMS symptoms, and 50% saw increased energy and mobility. Importantly, 44% of participants had PMDD, showing its effectiveness for severe cases.

Approved as a Class IIa medical device in the UK and EU, Nettle™ is safe, non-invasive, and free from severe side effects—offering a clinically proven, science-backed alternative to traditional treatments.

Samphire is a neurotechnology company dedicated to maximising women’s wellbeing during menstruation, postpartum recovery, and menopause. Co-founded by Emilė Radytė and Alex Cook, the brand is led by neuroscientists, engineers, and creatives on a mission to transform women’s health through groundbreaking wearable technology—providing scientifically validated devices that empower women to take control of their health.

With our Healf Curation Process, we do the work for you. Shop with confidence knowing that every item has been tried, tested, and curated for you.

Learn more about each step—Brand Discovery, Expert Validation, and Community Testing—here.

Shipping

At Healf, we prioritize safe and fast delivery for all our customers. Our carefully selected couriers are Royal Mail and DPD.

UK standard delivery

Enjoy free standard delivery on orders above £50, this option usually requires 2-3 working days. If your order is under £50, this delivery option is available for £3.99.

Next working day

For when you need our products urgently, we offer next working day shipping for £5.99. For orders placed before 12.00, we will ship it the same day to ensure you receive your order the next working day.

International

International deliveries can take 7 working days, and up to 4 weeks. The cost is £22.99 for orders below £50, £49.95 for orders above.

Returns

If for any reason you are not satisfied with your order, we provide free 365-day UK returns for all our customers. To initiate your return, simply contact us at team@healf.com, and we'll send you a return slip and help arrange a collection. The item you return must be sent in the same condition as received and inside the original packaging. Once received, we will notify you via email.

For international returns, we unfortunately do not cover the cost. However, we work with an array of carriers and can offer self-posting returns for customers shopping from outside the UK.

1. Place electrode covers over the electrodes.
2. Soak electrode covers in saline solution.
3. Place Nettle™ on your head, it should sit comfortably.
4. Connect with the Samphire App and start your 20-minute session.