Is your Transdermal MHT Really Made From Yams?

You may have heard that transdermal MHT used during menopause is “made from yams.” It’s a phrase that shows up on social media, in online groups, and even in conversation. But what does it actually mean?

Let’s break it down in plain language: While a compound from wild yams is used in the manufacturing process, there are no actual yams—or even yam extract—in transdermal MHT. Here’s the real story.

What’s in Wild Yams?

Wild Mexican yams (from the Dioscorea family) contain a substance called diosgenin. This is a plant-based molecule that, in a laboratory, can be chemically changed into hormones like progesterone and oestrogen.

However, this is not something that happens inside the body. Eating yams or rubbing yam cream on your skin does not turn into oestrogen. The transformation only happens in pharmaceutical labs, through careful chemical processes.

Step-by-Step: How Yams Become Hormones (in a Lab)

1. Extracting Diosgenin

Yam roots are harvested, dried, and ground into powder. Using chemical solvents, diosgenin is extracted. This is the only part of the yam that’s useful in hormone manufacturing.

2. Lab Transformation

Next, the diosgenin is transformed in a lab through a series of chemical reactions. These reactions turn it into oestradiol, a form of oestrogen identical to what your body naturally produces.

This process involves:

• Adding and removing oxygen and hydrogen atoms
• Reshaping the molecule’s structure
• Removing impurities using advanced techniques like chromatography

By the end, nothing from the original plant remains. What’s left is pure, pharmaceutical-grade oestradiol.

3. Turning Hormone Powder into Transdermal MHT

Once the hormone is purified, it’s mixed with ingredients that help it absorb through the skin. Then it’s sealed into a patch that sticks to your body, or turned into a spray or gel. All types of MHT delivers a steady dose of oestrogen and are made in tightly controlled factories that follow strict quality standards.

So Why Do People Say “Yam-Based”?

It comes down to marketing and misunderstandings:

• “Natural” sounds safer: People often believe that plant-based = gentle and safe. But whether oestrogen is made from yams or petroleum, the final molecule is exactly the same.
• Simplified explanations: Companies sometimes highlight “plant-derived” ingredients without explaining the complex process behind it. That leads to confusion.
• Misinformation spreads fast: Social media posts claiming “your patch is made from yams” can go viral, even when they’re not accurate.

The Risks of This Confusion

These myths might seem harmless, but they can cause real harm:

• Women may avoid hormone therapy because they think synthetic or pharmaceutical versions are unsafe.
• They may turn to unregulated “natural” creams, which often aren’t tested, don’t have consistent doses, and may not work at all—or could cause side effects.
• Trust in doctors can break down, especially when patients think they’re not being offered the “natural” options they read about online.

Where to Get the Right Information

If you’re trying to learn more about menopause and hormone therapy, stick with trusted sources:

• British Menopause Society (BMS)
• International Menopause Society (IMS)
• Faculty of Sexual and Reproductive Healthcare (FSRH)
• Menopause Research & Education Fund (MREF)
• TMC Health
• Respected menopause specialists like Dr Nighat Arif, Professor Nick Panay, Vikram Talualikar, Dr Joanne Hobson, Dr Wendy Knoops, and Dr Natasha Davidson

These experts rely on years of research and clinical trials—not internet rumours.

Final Takeaway: No, Your Patch Isn’t a Yam

To be clear: Your oestrogen patch is not made from yam juice or yam extract.

The hormone inside it may have started from a plant-based molecule like diosgenin, but it has been fully transformed into a lab-made version of oestradiol—the same hormone your body makes naturally. It’s carefully tested, purified, and safe.

So the next time someone tells you their patch is made from yams, you can gently explain: “Not really—it’s a pharmaceutical hormone that used to be a yam ingredient, but now it’s something else entirely.”

And that’s the truth simplified.