- Swedish pollen extract
- Swedish flower pollen
- Flower pollen extract
- Purified pollen extract
For Patients & Caregivers
Tell your healthcare providers about any dietary supplements you’re taking, such as herbs, vitamins, minerals, and natural or home remedies. This will help them manage your care and keep you safe.
What is it?
Pollen extract may be helpful in reducing menopausal symptoms, but studies in cancer patients are needed to confirm safety and effectiveness.
Pollen extract is an ingredient in a standard Swedish formula made from the pollen and pistils of grasses that are members of the Poaceae family. A few studies suggest that pollen extract may be helpful in relieving both premenstrual and menopausal symptoms. Although the mechanism by which this may occur is not well understood, pollen extract appears not to have hormonal effects. Therefore, it may be useful for breast cancer patients experiencing hot flashes. However, studies in cancer populations are needed to ensure safety, effectiveness, and to confirm that it does not negatively interact with chemotherapy drugs.
What are the potential uses and benefits?
- To relieve symptoms of menopause
Some studies suggest that pollen extract may reduce symptoms such as hot flashes and improve quality of life in menopausal women, but studies that confirm safety and effectiveness in cancer patients are needed.
- To relieve premenstrual symptoms
Some studies suggest that pollen extract may reduce premenstrual sleep disturbances.
What are the side effects?
Among the few studies conducted, there were no side effects that appeared to be related to pollen extract.
What else do I need to know?
For Healthcare Professionals
Pollen extract is an ingredient in a standardized Swedish natural product that contains both pollen and pistils derived from members of the Poaceae family of grasses. It has been used as an herbal remedy to relieve premenstrual, perimenopausal, and menopausal symptoms such as fatigue, hot flashes, irritability, and sleeplessness. Although the exact mechanism of action remains unclear, preclinical studies did not find estrogenic activity (1), suggesting it does not work by modulating hormones. This is of particular interest among patients with hormone-sensitive cancers who have limited options and may have safety concerns with more conventional methods to address such symptoms.
Initial open-label studies suggested that a standardized pollen extract was useful in alleviating premenstrual, perimenopausal, and menopausal symptoms (2) (3), although one of these studies combined the extract with royal jelly (3). In a follow-up randomized controlled trial, pollen extract reduced hot flashes and improve quality of life in menopausal women (4). A double-blind RCT found a reduction in premenstrual sleep disturbances, which was more pronounced in women who identified irritability as their main symptom (5).
No studies have been conducted in cancer populations. Therefore, additional clinical trials are needed to confirm safety and efficacy of pollen extract, including for use among cancer patients.
Pollen extract should not be confused with propolis, which is pollen harvested by bees from many different plant families, and may also include other substances such as beeswax.
Purported Uses and Benefits
- Premenstrual symptoms
- Menopausal symptoms
Mechanism of Action
There are two active ingredients in the formulation studied: a combined pollen and pistil extract (PI 82, 75%), which contains high levels of superoxide dismutase, and a pure pollen extract (GC FEM, 25%) (4). PI 82 pollen extracts are derived from Secale cereale (rye grass), Dactylis glomerata (orchard grass), and Pinus silvestris (Scots pine) while the pollen-pistil extract is derived from Zea mays. GC FEM pollen extract is derived from S. cereale, Z. mays, and P. silvestris (1). The preparation is standardized to contain 14 mg of amino acids per tablet (4).
Laboratory studies determined that the pollen extract preparation used in studies contained low concentrations of the phytoestrogens daidzin, daidzein, and genistin, that were considered to be subeffective. These studies also did not detect genistein, formononetin, or biochanin A (1). In vitro, purified Swedish pollen extract did not show inhibition of CYP2D6 enzymes (6). Animal studies suggest that high doses of pollen extract do not cause uterine growth in immature female rats, suggesting no estrogenic effects (1).
The exact mechanism for reduction of menopausal symptoms remains unclear but one study suggests that the antioxidant properties of the ingredients may play a role (4).