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07 — Biology

Toxins.
What your body encounters daily — and how it responds

This is not about being paranoid — it is about understanding dose-dependent biological effects that peer-reviewed research has documented. Endocrine-disrupting chemicals like BPA, phthalates, and PFAS are in food packaging, personal care products, and drinking water. They bind to hormone receptors at concentrations the regulatory agencies still classify as safe. Microplastics have been found in human blood, placental tissue, and lung tissue. Heavy metals accumulate over decades. The total body burden of these exposures is a variable most people never account for.

endocrine disruptorsmicroplasticsBPAPFASheavy metalsglyphosate
Evidence

What the research actually shows.

Peer-reviewed findings on toxins — not opinions, not trends.

01

Microplastics were detected in 77% of human blood samples in a 2022 study — with PET (from plastic bottles) and polystyrene as the dominant polymer types. A 2024 study found microplastics in 100% of arterial plaque samples from cardiovascular surgery patients.

02

BPA (bisphenol-A) binds to estrogen receptors at concentrations 1,000x lower than the current FDA 'safe' threshold. It has been found in 93% of urine samples tested by the CDC. Thermal receipt paper is one of the highest sources of dermal BPA absorption.

03

PFAS ('forever chemicals') are detectable in the blood of 98% of Americans. They accumulate in organs, disrupt thyroid function, impair immune response to vaccines, and have a biological half-life of 2-8 years — meaning it takes years to clear even after exposure stops.

04

Glyphosate residues were found on 70% of non-organic produce tested by the EWG. In vitro studies show glyphosate disrupts the gut microbiome at concentrations well below agricultural exposure levels by preferentially killing beneficial Lactobacillus and Bifidobacterium species.

From the Research

What 6 peer-reviewed studies show.

01

Exposure to silica dust increases the risk of tuberculosis in people with silicosis.

Meta-AnalysisPulmonology · 2025Jamshidi P., Danaei B. et al.PMID 37349198 ↗
02

Exposure to second-hand smoke increases the risk of lung cancer in people who have never smoked.

Meta-AnalysisEuropean respiratory review : an official journal of the European Respiratory Society · 2024Possenti I., Romelli M. et al.PMID 39537242 ↗
03
Biology Intelligence

Have a question about toxins?

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Methodology

Every article on toxins is built on systematic reviews, meta-analyses, and RCTs from PubMed. Evidence grade is always disclosed.

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Biology Intelligence retrieves answers from our verified study database. Ask anything about toxins.

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Connected Systems

Toxins connects to everything.

All topics →
01
Hormones

The chemical messengers running the show

02
Gut Health

Your second brain

03
Inflammation

The root of modern disease

04
Longevity

The science of aging well

The Weekly Dose

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Every week.

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Pulmonary fibrosis caused by occupational carcinogens may increase the risk of lung cancer.

Meta-AnalysisEuropean respiratory review : an official journal of the European Respiratory Society · 2024Krabbe J., Steffens K. et al.PMID 38355151 ↗
04

Exposure to air pollution is associated with an increased risk of heart failure.

Meta-AnalysisEnvironmental health perspectives · 2023Jia Y., Lin Z. et al.PMID 37399145 ↗
05

Exposure to air pollution is associated with an increased risk of influenza.

Meta-AnalysisEnvironmental health perspectives · 2023Yu L., Li X. et al.PMID 38078423 ↗
06

Air pollution is linked to a higher risk of colorectal cancer and poorer survival rates.

Meta-AnalysisEBioMedicine · 2024Jiang F., Zhao J. et al.PMID 38631091 ↗