Doctor's Note

Please feel free to post any ask-the-doctor type questions here in the comments section and I’d be happy to try to answer them. Check out the other videos which address allergies and asthma. And there are 1,449 subjects covered in the rest of my videos–please feel free to explore them!

For some more context, see my blog post: Mushrooms and Immunity

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  • Michael Greger M.D.

    Please feel free to post any ask-the-doctor type questions here in the comments section and I’d be happy to try to answer them. Check out the other videos which address allergies and asthma. And there are 1,449 subjects covered in the rest of my videos–please feel free to explore them!

  • kaodjs1

    I’d heard that scented products are generally “bad,” but the evidence put together here is so compelling that I’m buying unscented products for our home for the first time. Surprisingly, I am not missing the scents like I thought I would. Thank you, Dr. Greger!

  • John S

    Love the videos! Do you have a suggested list of household products that are “lower offgassing” and safer for our newborn? Thanks for your help Doc.

  • JordanLBray

    For all sorts of home and bath products, many of which you can’t avoid (like soap and toothpaste) the absolute BEST source I’ve found is Environmental Working Group. You can check to see the toxicity of your current products, from make-up to shaving cream, to just about anything else.  Check it out here:

    It reminds of this website – informative and user friendly!

  • David Paradine

    Could you post a link to your video regarding cleaning and getting chemicals off vegetables? I know I saw a title regarding this but I’m having no lick finding it. Thanks a lot for all your work.

  • Faith Mayabb

    My daughter has terrible asthma. I have read that increasing her D and balancing the Omega 3 and 6 is a cure-all. This info is backed by studies what are your thoughts on this? Here is the link to the studies:

    • Trig Trigger

      Dr. Hulda Clark

  • cheerypumpkin

    Hi Dr Greger,
    I have a burning question regarding the cookware we use to cook our food. Apparently some articles I read mention that metals such as nickel, chromium that made up the stainless steel cookware could bleed into our foods when we eat and thus our food is contaminated with toxic carcinogens. May i ask how true is that? As I am a nickel allergic, which is the best cooking hardware to use. Heard of a type called the surgical stainless steel, which is good for cooking as it retains its nutrients more than the others, however it is also made up of higher nickel components. Hope to hear your views on it!

  • Lori

    Are products labeled “fragrance free” safe?

  • Tina

    Dear Dr Greger, first of all, great job! But I have to criticize your latest video on household products and monoterpenes. Yes, our household products contain limonene and alpha-pinnene, but also all living plants emit these compounds and especially Mediterranean threes (sometimes up to ppm). What worries me, is that, knowing this, walking trough Mediterranean forest (where ozone concentrations and UV radiation are extremely higher that in closed rooms) or introducing flowers with intensive smell or Christmas threes into your home, you will get the same effect. So when you say that introducing plant monoterpenes IN OUR HOMES it is being transformed into formaldehyde (which quoted paper does not say and it describes very controlled experimental set up for testing processes in atmosphere), you are ignoring the fact that you don’t have a proof of that (at least not in this video). Also these processes are part of our natural environment and this is what happens to all monoterpenes in our atmosphere. My criticism is that you are giving a wrong impression and only half information when you say that monoterpenes such as limonene is transformed into formaldehyde and therefore bad for us, without actually connecting it with handhold products or mentioning any concentrations and what do they mean. I can imagine that now a lot of people will avoid anything that has limonene written on it, but if someone wants to really avoid limonene, he can just stop breathing. From perspective of your video and knowing for example that tomato plant is emitting a lot of limonene, eating tomato on sunny day in the garden might be toxic. I like your work very much, but with the last part of this video, I think you have stepped into “the gray zone” of science and I am sure you don’t want to be there.

  • Georgia Cline

    We have heard of the recent scare surrounding the use of propylene glycol in Beneful Dog Food. We have been using Listerine mouthwash for years with ALCOHOL and decided to seek something a little safer. So my husband picked up Listerine ZERO at the local market. True while it does not contain alcohol, the 3rd item listed is PROPYLENE GLYCOL and the 4th is sodium lauryl sulfate. I have looked for warnings about propylene glycol in human food and cosmetic items. All say “considered safe” for human use preferably not ingested.


    • Joseph Gonzales R.D.

      We do not have an official update on propylene glycol. It may be generally recognized as safe (GRAS), but there are many studies that report on potential toxicity. Interesting about the mouthwash! Have you seen our video on making your own?

  • DanielFaster

    It’s very easy to make your own hand soap, laundry soap and fabric softener.

  • Casey Jones

    I have issues with the perfumes and things in these cleaners! I am glad I am not the only person that has problems with them. Hopefully I can find some nice scent free cleaning products.

  • justified15


    Aug 10, 8:59 PM

    Which cooking pans are the safest and dangerous to use? Aluminum, cast iron, stainless, Teflon, ceramic, glass, etc..?
    thanks for the reply