Industrial chemical carcinogens, such as PCBs, have been concentrating up the food chain for years and building up in animal fat. Many were banned in 1979 and fortunately have since been in decline in terms of daily intake levels. But one dietary source still remains a threat: fish and fish oil (see also here, here, here, here). Eggs may also be highly contaminated. Some PBCs act as xenoestrogens; they can have estrogenic effects and may adversely affect male sperm counts and may even be responsible for early onset puberty.

Topic summary contributed by Denise.
To help out on the site, email

Watch videos about PCBs

  • Is Distilled Fish Oil Toxin-Free?
    Is Distilled Fish Oil Toxin-Free?
    Researchers test molecularly distilled fish oil supplements for industrial pollutants.
  • Hair Testing for Mercury
    Hair Testing for Mercury
    Due to the state of the world's oceans, human biomarkers for fish consumption now include dioxins, PCBs, and mercury.
  • DDT in Fish Oil Supplements
    DDT in Fish Oil Supplements
    Though banned decades ago, the pesticide DDT persists in the food supply.
  • Xenoestrogens & Early Puberty
    Xenoestrogens & Early Puberty
    Until the twentieth century, the average age of puberty for girls was 16 or 17 years old.
  • Xenoestrogens & Sperm Counts
    Xenoestrogens & Sperm Counts
    Endocrine disrupting xenoestrogens in fish may be interfering with male fertility.
  • Mercury in Vaccinations vs. Tuna
    Mercury in Vaccinations vs. Tuna
    Balancing the risks and benefits of fish consumption.
  • Farmed Fish vs. Wild-Caught
    Farmed Fish vs. Wild-Caught
    The levels of industrial pollutants found in aquaculture.
  • Flame Retardant Chemical Contamination
    Flame Retardant Chemical Contamination
    A way to detoxify one's body of industrial pollutants found in the food supply.
Page 2 of 212