Semaine Health Review 2026: Do Its Supplements Work?

Semaine Health is a US supplement brand for women's hormonal health, with formulas for PMS and period pain, daily hormone balance, urinary health, gut health and perimenopause. It markets its products as plant-based, doctor-developed and clinically studied. This Semaine Health review looks at what each product is meant to do, what the evidence behind the marketing actually is, what the small number of independent reviews say, and what it costs.

Medical note: this article is general information, not medical advice. Supplements are not a substitute for a doctor's diagnosis or treatment. Talk to your doctor or pharmacist before you start any supplement, especially if you are pregnant, breastfeeding, taking prescription medicine (including hormone therapy) or managing a condition such as endometriosis or recurrent urinary infections.

Our verdict in brief

Semaine Health is worth a cautious look if you want a plant-based option for period discomfort and have already ruled out medical causes with a doctor. The few independent owner reviews of its PMS & Period Support formula are positive. However, almost every efficacy number in circulation comes from the brand's own customer surveys, not from published, independent trials, and there is very little independent coverage of the brand overall. Treat the headline claims as marketing until you see the underlying studies, and use the first-order refund window to judge it for yourself.

How we researched this review

Simple Life Reviews did not take Semaine supplements ourselves. We read the brand's own website, the four owner reviews on Thingtesting and a long first-person review on Parsnips and Pastries. That blog publishes affiliate links and a discount code for Semaine, and one of the Thingtesting reviews received a reply from a Semaine co-founder, so neither source is fully independent. We found no Reddit threads, Trustpilot profile or medical publications in our source set, which is itself a limitation readers should weigh.

Who makes Semaine and what it claims

According to Parsnips and Pastries, Semaine was started by a couple, Lauren and Matt: Lauren had endometriosis and relied heavily on painkillers for period pain, and Matt, who has a biology PhD, developed a formula meant to be strong enough for severe cramps but gentle on the stomach. The name is French for "week", a nod to hormones that change through the month and across life.

The Semaine website claims more than 10,000 happy customers and names a medical advisory board that includes an OB-GYN, a urologist and a physical therapist. It also says its final formulations are clinically studied by an independent third-party lab. Our sources do not link to or describe those studies in detail, so we could not check their design, size or results.

Semaine's main products

The brand's line covers five core formulas. The table summarises the results Semaine reports from its own customer surveys, as quoted by one reviewer; these are self-reported outcomes, not controlled clinical results.

PMS & Period Support

This is the formula with the most independent feedback. On Thingtesting, one buyer said it cut her sister-in-law's severe cramps by about 25% to 30%, another with endometriosis said it helped her rely less on painkillers when taken a day or two before her period, and a third who cannot take Midol reported shorter, less painful periods. These are encouraging but anecdotal accounts from a handful of people.

Peri/Menopause Essentials

The blend uses plant extracts such as bergamot, olive fruit and red clover, which contain plant compounds sometimes called phytoestrogens. Parsnips and Pastries relays the brand's claim that it targets 14 menopause symptoms within 4 weeks. Red clover and similar ingredients may not suit people with a history of hormone-sensitive conditions or those taking hormone therapy, so this is one to clear with a doctor first.

Urinary Tract Cleanse & Protect

The "UTI-free" claim is the boldest in the range, and it comes from a customer survey rather than a trial in the source we read. A urinary infection needs prompt medical care and often antibiotics; a supplement should never be used in place of treatment, and symptoms such as fever, back pain or blood in the urine need a doctor straight away.

What the evidence really shows

There are three kinds of evidence behind Semaine, and they are not equal:

• Brand survey figures such as the hair-thickness and UTI-free percentages. These are self-reported, usually from customers who kept buying, with no control group, so they tell you how satisfied regular buyers are, not how well the product works.
• Star ratings on Semaine's own site and on Amazon. Ratings on the brand's site are typically higher than on Amazon, which is a common pattern.
• Independent owner reviews. The four on Thingtesting are all positive, and the site shows 100% would recommend, but four reviews is a very small sample.

The brand says its formulas are clinically studied by an independent lab, yet none of our sources provides the study details. Until those are published in a form you can read, treat the specific percentages with caution.

Price, subscription and refunds

Parsnips and Pastries reports that Semaine supplements cost $27.99-$34.99 each on subscribe and save, with monthly deliveries you can cancel at any time and one-time purchases costing a few dollars more. The same review describes a 100% Happiness Guarantee with a full refund on the first order within 30 days. The Semaine website advertises free shipping on subscriptions.

Current prices on Semaine's product pages, before any subscription discount, were: PMS & Period Support $33.99, The Daily $39.99, Urinary Tract Cleanse & Protect $34.99, Pre+Probiotic For Women $34.99 and Peri/Menopause Essentials $39.99.

Thingtesting reviewers also mention finding the period formula at Thrive Market, Target and TJ Maxx, so you can buy a single pack without subscribing.

Alternatives to consider

The most important alternative is a conversation with a doctor. For painful periods, proven options include over-the-counter anti-inflammatory painkillers and, where suitable, hormonal treatments; severe pain can signal endometriosis or another condition that needs diagnosis. Perimenopause symptoms can be treated with hormone therapy or non-hormonal prescriptions that have published trial evidence. Urinary infections need medical assessment and usually antibiotics.

If you still prefer a supplement, other brands sell plant-based PMS and menopause formulas, often with similar ingredients. Compare them on the evidence they publish rather than on star ratings: look for a named study you can read, the dose of each ingredient, and independent third-party testing of purity.

Pros and cons

Pros

• Women-focused range covering periods, hormones, gut, bladder and perimenopause
• Plant-based, gluten-free, soy-free and non-GMO formulas, per the brand
• Positive independent owner reports for the PMS & Period Support formula
• Named medical advisers and a stated third-party study programme
• First-order refund guarantee and cancel-anytime subscriptions

Cons

• Headline results come from the brand's own surveys, not independent trials
• Very little independent coverage; our main review source earns affiliate commission
• Some ingredients may interact with hormones or medication
• Subscription pricing adds up if you take several formulas
• Bold urinary and menopause claims are hard to verify

Who should consider Semaine Health, and who should skip it

Consider Semaine if you have recurring period discomfort or mild perimenopause symptoms, your doctor has ruled out other causes, and you would like to try a plant-based option alongside, not instead of, medical care.

Skip it, or talk to a doctor first, if you are pregnant or breastfeeding, have a hormone-sensitive condition, take hormonal medication or blood thinners, or have symptoms of a urinary infection that need treatment now. If you want strong, independently published evidence before buying, Semaine does not yet provide it in our sources.

Our ratings

Overall: 3/5, because independent owners on Thingtesting report real relief from period symptoms, but the brand's efficacy numbers are self-reported surveys and independent evidence is thin.

PMS & Period Support: 3.5/5, because several owners on Thingtesting describe less cramping and lower painkiller use, though the sample is small and anecdotal.

FAQ

What kind of company is Semaine Health?

It is a women's health supplement brand founded by a couple after one of them struggled with endometriosis and period pain. It sells plant-based formulas for periods, hormone balance, gut and urinary health, and perimenopause.

Do Semaine supplements actually work?

Some owners report clear relief, especially from period pain, but most published success rates come from the brand's own customer surveys. There is no independent, published trial in our sources, so results are uncertain and will vary.

Is Semaine Health safe?

The formulas are plant-based, but plant extracts can still interact with medicines and hormones. Check the ingredient list with your doctor or pharmacist before use, particularly if you are pregnant, breastfeeding or on prescription medication.

Can Semaine replace antibiotics for a UTI?

No. A urinary infection needs medical assessment and often antibiotics. A supplement may be discussed with your doctor for prevention, but it should never replace treatment.

Can I get a refund if Semaine does not work for me?

Yes, for your first order: Parsnips and Pastries reports a full refund within 30 days of the first order. Subscriptions renew automatically until cancelled, so check the current terms before ordering.

How long does Semaine take to work?

According to the brand survey timings relayed by Parsnips and Pastries, buyers report changes after 1 to 3 months of use, depending on the product. These are self-reported timings, not trial results, and many people may notice no change at all.

Where can I buy Semaine?

On the brand's website, on Amazon, and at some retailers such as Target and Thrive Market, according to owner reviews.