SkinScience 101 with Dr. Adrienne Denese, MD PhD
"Knowledge is the first step to your most beautiful skin. Every Wednesday, I’m opening my lab notes to share a new "class" on the clinical science behind skincare. Consider this your personal library of skin education - designed to help you look past the marketing and understand the real biology of aging." ~ Dr. Denese
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The Glyphosate Brief: Risks & Personal Protection
Glyphosate is the active chemical ingredient in Roundup and the most heavily used weed killer in human history. Originally patented as an industrial descaling agent to clean pipes, it was repurposed as a broad-spectrum herbicide in the 1970s. Today, it is applied to millions of acres of farmland, suburban lawns, public parks, and school playgrounds.
Because of its ubiquitous use, a Centers for Disease Control and Prevention (CDC) biomonitoring study revealed that an estimated 81% of Americans have detectable levels of glyphosate in their urine.
Why Is Glyphosate So Damaging?
For decades, the standard scientific narrative was that glyphosate is perfectly safe for humans because it targets a specific metabolic pathway (the shikimate pathway) that exists in plants but not in animals. However, independent modern research has revealed significant health and environmental risks.
- Carcinogenic Potential (Non-Hodgkin Lymphoma): In 2015, the World Health Organization’s International Agency for Research on Cancer (IARC) classified glyphosate as a Group 2A "probable human carcinogen." This was backed by comprehensive meta-analyses showing that individuals with high occupational exposure (like farmers and groundskeepers) faced a significantly increased risk of developing Non-Hodgkin Lymphoma, a cancer of the lymphatic system.
- Gut Microbiome Disruption: While human cells do not have a shikimate pathway, the beneficial bacteria in your gut do. Glyphosate acts as an antimicrobial agent in your digestive system, selectively killing off "good" bacteria (like Lactobacillus and Bifidobacterium) while allowing harmful strains like Salmonella and Clostridium to survive. This imbalance—known as dysbiosis—is increasingly linked to leaky gut, systemic inflammation, and metabolic disorders.
- DNA Damage & Oxidative Stress: Recent data published by international research teams shows that glyphosate-based formulations cause cellular damage by creating oxidative stress and damaging DNA pathways—even at doses previously labeled "safe" by regulatory bodies.
- The Pre-Harvest "Dessication" Loophole: Many people assume glyphosate is only sprayed on genetically modified (GMO) crops. However, it is routinely sprayed on non-GMO grains and legumes (like oats, wheat, chickpeas, and lentils) right before harvest. Farmers use it as a "desiccant" to dry out the crops quickly so harvesting machinery can run faster. This late-stage spraying results in exceptionally high residue levels in everyday foods.
The Contamination Scale in Common Foods
Testing by organizations like the Environmental Working Group (EWG) highlights just how significantly conventional processing impacts glyphosate retention compared to organic alternatives.
Actionable Steps to Protect Yourself
Eliminating 100% of glyphosate exposure is incredibly difficult due to chemical drift through the air and water, but you can dramatically reduce your body burden. Peer-reviewed intervention studies show that switching to an organic diet for just six days can lower urinary glyphosate levels by 70%.
1. Re-Engineer Your Diet
- Prioritize Organic for "Dry Down" Crops: If your budget forces you to choose where to buy organic, always prioritize oats, wheat, corn, and legumes (beans, lentils, hummus). These are the crops most subject to pre-harvest desiccation.
- Look for Specialized Certifications: In addition to the USDA Organic seal, look for the "Glyphosate Residue Free" label certified by The Detox Project. This guarantees third-party laboratory testing specifically for this chemical.
- Wash and Peel Conventional Produce: For fruits and vegetables where you cannot buy organic, wash them thoroughly under running water and peel the skin off when possible to remove surface-bound residues.
2. Safeguard Your Home and Community
- Ban Chemical Weed Killers at Home: Stop using Roundup or generic glyphosate formulas on your driveways, lawns, and gardens. Switch to manual weeding, flame weeders, or natural alternatives like high-acidity horticultural vinegar, salt, and soap solutions.
- Avoid "Professional" Chemical Lawn Treatments: Many commercial lawn care companies apply systemic herbicides without explicit warning labels. Opt for organic lawn care or companies that explicitly pledge to be glyphosate-free.
- Take Your Shoes Off at the Door: Glyphosate is heavily tracked into households from public parks, treated sidewalks, and neighbors' lawns. A strict "no-shoes" policy indoors keeps pesticide-laden dust out of your living space.
A Note on Global Regulation: As of 2026, the scientific consensus regarding glyphosate is shifting rapidly. While certain regulatory agencies like the US EPA continue to evaluate its registration status, major consumer toxicological panels and scientific statements (like the University of Washington's Seattle Statement) are strongly urging global governments to treat glyphosate-based formulations as hazardous and strictly curb their use in public spaces.
Stay safe, my friends!
Dr. Denese