Does Relizen work for hot flashes?

Our verdict: Not supported once placebo is properly controlled for.

Relizen is a pollen-extract supplement marketed for hot flashes and night sweats. It belongs to a product family (also sold as Femal and Serelys in other markets) that has actually been studied more than most menopause supplements — which makes it a useful, concrete example of why controlled trials matter.

What the evidence actually shows

A 2024 systematic review and meta-analysis focused specifically on purified pollen extract — explicitly searching for Relizen, Femal, and Serelys by name — for vasomotor symptoms. It identified 5 studies (1 randomized controlled trial and 4 observational studies, 420 women total). Pooling all of them together showed significant improvements in hot flashes, night disturbance, depression, and muscle aches.

But here's the critical finding: when the reviewers limited their analysis to only the placebo-controlled studies, those improvements were no longer statistically significant. Their own conclusion states plainly that the vasomotor symptom improvements seen in uncontrolled studies "may have been due to the placebo effect". The good news in the same review: no significant adverse effects were associated with pollen extract use.

A closer look at Relizen's own marketing

Relizen's own product page cites a 75% reduction in hot flash frequency and a 70% reduction in night sweats, presented under a "Results backed by science" heading. Looking at the brand's own footnote for that specific figure, the source is a survey of 4,925 customers who had already been taking Relizen for at least 3 months — not a placebo-controlled clinical trial.

That distinction matters a lot. A survey of people who were already loyal, paying customers after three months will systematically miss anyone who stopped because it didn't work, and can't separate a real effect from the placebo response that the independent meta-analysis found disappears under proper controls. Presenting a customer-satisfaction survey figure under a "science" heading, next to citations of actual clinical trials, blurs a distinction that matters for an honest evaluation.

What to consider

• No proven benefit over placebo once controlled trials are isolated, per the most recent independent meta-analysis
• No significant safety concerns were identified — this isn't a safety warning, just an efficacy one
• Because our grade is Not supported, we don't place affiliate links for Relizen on this page — see how we grade evidence and products we won't recommend

If you're looking for hot flash options with stronger controlled-trial evidence, see our does it work? evidence checker or non-hormonal prescription and behavioral treatments.