Best Period Pants UK (2026): PFAS-Checked and OEKO-TEX Certified Picks

What are the best period pants in the UK?

For most people, the best period pants are a pair that fits your flow and has been independently tested for harmful substances. Our top pick is fluxies Essential Brief Heavy Flow, which is OEKO-TEX Standard 100 certified, states "no added PFAS" and has organic cotton next to the skin. Modibodi and Bodyform Intimawear are also OEKO-TEX certified, while WUKA is the best-known UK brand and the M&S 3-pack is the cheapest way to try them.

Why focus on testing? Because the biggest worry with period pants has been PFAS ("forever chemicals"), which have been found in some brands. Choosing certified pants is the simplest way to lower your exposure.

Our picks at a glance

Here "Strong" means the product carries an independent textile test (OEKO-TEX) for harmful substances; it is not a claim about health outcomes.

Are period pants a healthier choice?

Period pants are a reusable alternative to pads and tampons. The NHS lists pads, tampons, menstrual cups and reusable washable pads as the main options, and all are reasonable choices. One practical plus of period pants is that, unlike tampons and menstrual cups, they are worn outside the body, so they are not linked to toxic shock syndrome, which the NHS notes can happen with tampon or cup use (it is rare).

They also cut waste and long-term cost: a pair that lasts 50 or more washes replaces a lot of disposable products.

Do period pants contain PFAS?

Some have. PFAS are a large family of man-made chemicals that resist water, stains and grease, and some textile makers have used them to make fabrics leakproof. A 2025 study in Environmental Science and Technology Letters, reported by Euronews, tested 59 reusable period and incontinence products from North America, South America and Europe. Nearly 30% appeared to have intentionally added PFAS, with period underwear and reusable pads the most affected. Crucially, every category also had products without added PFAS, showing they are not needed for the products to work.

How much PFAS passes through skin from underwear is not known. Researchers quoted in that report noted most PFAS exposure comes through food and water, and that the extra contribution from skin or vaginal contact is unclear. So this is a reasonable precaution, not an emergency.

What does OEKO-TEX certification tell you?

OEKO-TEX Standard 100 is an independent lab test of the finished textile and all its parts against limits for a long list of harmful substances, with stricter limits for items in close skin contact. Since 2023, OEKO-TEX has banned PFAS in textiles certified under Standard 100. So an OEKO-TEX label is the best shortcut a shopper has today.

What it does not tell you: it is not an organic or environmental standard, and it does not test absorbency or leak protection. A certificate also applies to specific products, so look for the label or licence number on the item you buy. Bodyform, for example, prints its licence number (12.HSL.09587) on the product page.

How we chose

We started with UK-available brands, then checked each product page for an independent textile certification, a PFAS statement, the absorbency in ml and the fabric next to the skin. We also looked for antimicrobial silver finishes, which some brands add to control odour. We verified prices on brand stores and Ocado in October 2026 and included budget to premium options across six brands.

The best period pants, reviewed

fluxies Essential Brief Heavy Flow: best overall

UK brand Flux states both OEKO-TEX Standard 100 certification and "no added PFAS" on the product page, with a 95% organic cotton body and lining. The heavy brief holds up to four tampons' worth for up to 12 hours. Caveat: the absorbent core is microfibre with a TPU film barrier, so it is not all-natural, and single pairs cost more than multipacks.

Modibodi Classic Full Brief Moderate: best range of absorbencies

Modibodi states its pants are OEKO-TEX Standard 100 certified, and the range runs from light (20ml) to heavy-overnight (40ml). The moderate full brief holds 30ml, about six tampons. Caveat: the body is bamboo viscose, a heavily processed fibre, and the core includes merino wool.

Bodyform Intimawear Bikini: best supermarket pick

Easy to buy with the weekly shop, OEKO-TEX certified with a checkable licence number, and said to last at least 50 washes. Caveat: the fabric is fully synthetic and the absorbency in ml was not given on the page we checked.

WUKA Stretch Seamless Midi Brief Heavy: best fit range

WUKA's heavy pants hold 20ml or more and come in two stretch size bands covering XS to 3XL, with cotton next to the skin. WUKA says it avoids silver and antibacterial finishes. Caveat: we did not find an OEKO-TEX or PFAS test result on the product page, so ask WUKA for test reports if this matters to you.

M&S Heavy Absorbency 3-pack: best budget

Three cotton-rich full briefs for £16, about £5.33 a pair, so you can build a full set cheaply. Caveat: no certification or PFAS statement was shown, and absorbency in ml is not stated.

Nixi Body The Anne Boxer: best for sport

A boxer cut that stays put under leggings, holding up to 25ml, from a UK brand designed for running and gym use, and for bladder leaks too. Caveat: it is the priciest pick and lists no chemical testing.

What to avoid

• Unclear "antibacterial" or "odour-control" claims: these can mean silver or other treatments. Plain fabrics washed properly control odour well.
• No information at all: if a brand cannot tell you whether PFAS are added, choose one that can.
• Fabric softener: it clogs absorbent layers. Rinse in cold water, wash at 30 to 40°C and air dry.
• Ignoring heavy bleeding: if you soak through protection every hour or two, see the NHS advice on heavy periods and speak to a GP.

Bottom line

Period pants are a comfortable, reusable alternative with no link to toxic shock syndrome. The main thing to check is chemical testing: pick OEKO-TEX Standard 100 certified pants, ideally with a clear "no added PFAS" statement, such as fluxies, Modibodi or Bodyform. If cost is your priority, the M&S 3-pack is the cheapest way to start, and you can add certified pairs over time.