What is the role of SERMs for skin, and how do they compare to estrogen?

SERMs, or selective estrogen receptor modulators, are often talked about as an alternative to topical estrogen, so it makes sense to wonder how they stack up. In short, they behave very differently from estrogen when it comes to skin.

A SERM isn’t estrogen. It’s a compound that can attach to estrogen receptors in certain tissues, including skin, but it doesn’t trigger the same hormonal pathways that actual estrogen does. In the YouTube chapter where Dr. Ellen Gendler discusses this, she explains that SERMs interact with skin estrogen receptors without behaving like true estrogen in the rest of the body. They were originally explored partly because of fear around estrogen after the WHI era, not because they worked better for skin.

Topical estrogen, especially estriol, is much more straightforward. Your skin has estrogen receptors in every cell, and estriol directly boosts collagen, increases hydration, and improves elasticity. Here at Alloy, we use estriol in the M4 line because it acts locally on the skin and doesn’t raise systemic estrogen levels. That local action is what gives you the improvements in firmness, bounce, and texture that showed up in our clinical studies. SERMs simply haven’t shown that same level of visible skin benefit.

If you want to hear Dr. Gendler explain this difference in her own words, the SERMs section is here: SERMs & Alternatives.

If you’re curious about using estrogen directly on your skin, our prescription M4 Face Cream Rx is a good place to start. You can read more about it here: M4 Face Cream Rx.

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