Do microplastics affect estrogen levels?

Do Microplastics Affect Estrogen Levels

⚕️ MEDICAL DISCLAIMER: This article is for informational and educational purposes only and is not intended as medical advice, diagnosis, or treatment. Always consult with a qualified healthcare provider before making any changes to your health regimen, diet, or supplement use, especially if you have existing medical conditions or take medications. The information presented here should not be used to diagnose, treat, cure, or prevent any disease.

Hormones play a critical role in determining our development, reproduction, energy, and behavior. This is why anything that disrupts our normal hormone production, often known as endocrine disruptors, are among the most dangerous toxins in modern life. Unfortunately for us, microplastics and their additives have been found to be prominent endocrine disrupting chemicals (EDCs). More and more evidence shows that microplastics affect estrogen by mimicking it, elevating estrogenic signaling, and distorting the hormonal balance that greatly influences health.

Microplastics Affect Estrogen Production 

Plastics are not inert. They are manufactured with plasticizers, antioxidants, flame retardants, and other chemical additives [1–12]. Many of these are classified as EDCs, with chemical structures that closely resemble natural hormones such as estradiol [3]. This mimicry enables these chemicals to dock at estrogen receptors and interfere with signaling, often amplifying hormonal activity far beyond normal bounds.

Compounds like bisphenol A (BPA), phenylphenols, biphenols, and 4-tert-octylphenol are notorious for their ability to bind to estrogen receptors and disrupt reproductive systems [4, 6]. Even byproducts of parabens have demonstrated estrogenic activity in human breast cancer cell lines [14]. Once microplastics release these additives, hormone disruption can occur. 

How Microplastics Amplify Hormonal Signaling

The combination of microplastics with other chemicals can have more pronounced effects. Polystyrene nanospheres combined with the UV filter homosalate triggered heightened estrogen receptor activation in breast cancer cells, resulting in abnormal proliferation [15]. In zebrafish, this same co-exposure increased estradiol release and accelerated ovarian development [15]. This finding is consistent in mammals, as demonstrated by a study where rabbits exposed to PVC microplastics displayed elevated estradiol, while mice exposed to polystyrene microplastics showed higher blood serum estrogen, a change linked to early sexual maturation [16]. Even male marine fish demonstrated amplified estrogenic effects when exposed to polystyrene microplastics alongside synthetic estrogens [17, 18].

Microplastics also act as vectors. They can absorb hormones on their surfaces, like estradiol and endocrine disruptors from the environment, altering their bioavailability inside organisms [4, 5, 10, 13, 19, 20].

When Microplastics Cause Estrogen To Drop Instead of Rise

Endocrine disruption is not always straightforward. Some studies reveal the opposite effect to that which was discussed previously. Sometimes, microplastics seem to reduce estrogen levels. Female rats exposed to high doses of certain plastic additives showed declines in estradiol and disruptions in follicle-stimulating and thyroid-stimulating hormones. Fish exposed to polyethylene microplastics exhibited diminished sex steroid levels, while polystyrene nanoplastics reduced estradiol and disrupted estrous cycles in rodents [13, 20]. Studies also show that plasticizers like DEHP inhibit aromatase, the enzyme responsible for estrogen synthesis, further suppressing estradiol production [4]. These findings underscore the complexity of endocrine disruption, where the same pollutant can both mimic and diminish hormone activity depending on context.

The Low-Dose Paradox of Microplastics and EDCs

Perhaps the most unnerving feature of microplastics and EDCs is the “low dose effect” [11]. Unlike many toxicants, endocrine disruptors can exert the strongest impacts at vanishingly small concentrations. Because the body’s hormonal signaling is tuned to respond to trace levels, even minimal microplastic and EDC exposure can alter reproductive cycles, maturation timing, and developmental pathways. Effects may vanish at higher doses, producing unpredictable, non-linear responses that defy traditional toxicology [11].

A Distorted Hormonal Symphony

Scientific studies show that microplastics and their additives can and do influence estrogenic activity. Sometimes they increase circulating estrogen and sometimes they suppress it, but in both cases they distort the delicate signaling balance that underpins reproductive health. These disruptions have profound implications for fertility, maturation, and disease risk.

For individuals concerned about their health, developing a strategy to reduce microplastics intake is critical to promote proper hormone function. While it’s extremely difficult, if not impossible, to avoid microplastics, there are many small, simple actions that you can take each day to lower the amount of microplastics you consume. This is why we developed the Deplasto platform. 

Our platform, consisting of a wellness supplement, an app for tracking microplastic intake over time, and lifestyle recommendations is intended to help you avoid microplastics. Our supplement, that contains ingredients used in studies involving microplastics, is formulated to support your body’s natural detoxification defenses, including oxidative stress management, cellular repair, and antioxidant support. Our microplastic intake app is designed to show you an estimate of your daily exposure, with every datapoint backed by scientific studies, to help you understand how you can best avoid microplastics. Lastly, given that it’s nearly impossible to completely avoid microplastic exposure, we have a plethora of lifestyle recommendations designed to help you make small changes for big impacts. 

Overall, we believe that the best way to eliminate microplastics begins with you and the changes you make to your daily life. Over time, collectively, we can make a significant difference. 

Sources

1. A systematic review of microplastics emissions in kitchens- Understanding the links with diseases in daily life
2. Behavioral Studies of Zebrafish Reveal a New Perspective on the Reproductive Toxicity of Micro- and Nanoplastics
3. Adverse health effects of exposure to plastic, microplastics and their additives- environmental, legal and policy implications for Israel
4. Can Mammalian Reproductive Health Withstand Massive Exposure to Polystyrene Micro- and Nanoplastic Derivatives_ A Systematic Review
5. Effects of Polyvinyl Chloride (PVC) Microplastic Particles on Gut Microbiota Composition and Health Status in Rabbit Livestock
6. Effects of polystyrene micro- and nanoplastics on androgen- and estrogen receptor activity and steroidogenesis in vitro
7. Impact of Microplastics on Pregnancy and Fetal Development- A Systematic Review
8. Impact of polyethylene microplastics exposure on kallikrein-3 levels, steroidal-thyroidal hormones, and antioxidant status in murine model- protective potentials of naringin
9. Melatonin counteracts polyethylene microplastics induced adreno-cortical damage in male albino rats
10. Microplastic and human health with focus on pediatric well-being- a comprehensive review and call for future studies
11. Microplastics may induce food dilution and endocrine disrupting effects in fathead minnows (Pimephales promelas), and decrease offspring quality
12. Molecular and Cellular Effects of Microplastics and Nanoplastics- Focus on Inflammation and Senescence
13. A review of the neurobehavioural, physiological, and reproductive toxicity of microplastics in fishes
14. Aromatase as a novel target of parabens in human and rat placentas
15. Combined Effects of Polystyrene Nanosphere and Homosolate Exposures on Estrogenic End Points in MCF-7 Cells and Zebrafish
16. Effects of Polyvinyl Chloride (PVC) Microplastic Particles on Gut Microbiota Composition and Health Status in Rabbit Livestock
17. Behavioral Studies of Zebrafish Reveal a New Perspective on the Reproductive Toxicity of Micro- and Nanoplastics
18. Independent and synergistic effects of microplastics and endocrine‐disrupting chemicals on the reproductive social behavior of fathead minnows (Pimephales promelas)
19. Effects of the adsorption behavior of polyamide microplastics on male reproductive health by reduction of testosterone bioavailability
20. A critical review of microplastics toxicity and potential adverse outcome pathway in human gastrointestinal tract following oral exposure
21. Female zebrafish are more affected than males under polystyrene microplastics exposure
22. Effects of polystyrene nano- and microplastics on human breast epithelial cells and human breast cancer cells