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View Diary: Yet Another Reason to Kick Shampoo (190 comments)

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  •  Information from a reputable source (6+ / 0-)

    According to the FDA, " “Although DEA itself is used in very few cosmetics, DEA-related ingredients (e.g., oleamide DEA, lauramide DEA, cocamide DEA) are widely used in a variety of cosmetic products. These ingredients function as emulsifiers or foaming agents and are generally used at levels of 1% to 5%."

    From the link:  

    "A study from 1999 on the potential effects of DEA involved applying a pure concentration of this ingredient directly to mouse skin for a period of 14 weeks (minimum) and 2 years (maximum). The study reported no evidence of carcinogenicity when low doses (50–100 mg per kilogram of body weight) were used. Internal changes to organs (liver, kidneys) and external signs (inflammation, ulcers) were found as the dosages of DEA increased (up to 800 mg was used) (Source: National Toxicology Program Technical Report Service, volume 478, July 1999, pages 134–212). Although the results of this study are interesting, it is still unrelated to how DEA is used in cosmetics products and how consumers use them. In most instances, our contact with DEA in any form is brief, and most likely is not cause for alarm."
    •  Thinking about dosage (7+ / 0-)

      So -- they found no effect at 100 mg per kg of body weight.

      If a person weighed 120 pounds, that's 54.5 kg, for a dosage of 100 mg/kg X 54.5 kg = 5450 mg, or 5.5 g.

      If you use a generous ounce of shampoo per day, that's about 30 grams (assuming ~1g per mL).

      So if you're a small person of 120 pounds, the concentration can be up to 18 percent DEA by weight with no known problem. If you're a heavier person of 175 pounds the concentration can be up to 26 percent DEA by weight. I think both of those are unlikely for a minor ingredient; after all, shampoos are 70 to 80 percent water to start with.

      Of course all this is assuming, as with the mouse study, you apply the shampoo to your skin and leave it there for 14 weeks to 2 years.  Without rinsing it off.

      I think it is more likely most people would rinse the shampoo off after a few seconds.

      In other words, I think the concern voiced here, while understandable, is not based on realistic assumptions.

      And I'm puzzled about jumping through the hoops of making some other solution.  Why not use a simple bar of soap?  Organic if you wish?

      •  "not based on realistic assumptions" (2+ / 0-)
        Recommended by:
        VelvetElvis, kyril

        I agree!  Thank you for doing the math :-)

      •  Soaps leave residue (0+ / 0-)

        which typically isn't a problem for skin, since the residue just sloughs off with your dead skin cells anyway, but it can gunk up hair in the same way it can gunk up your sink/shower/dishes. Hair washed with soap tends to look pretty dull almost immediately, and over time, long hair in particular can get kind of stiff and sticky.

        Most people prefer to use detergents for everything but skin these days because detergents rinse off fairly clean.

        If you decide not to go with a detergent, there are a lot of other ways to remove oils/dirt without the disadvantages of soap, of which the DIY baking soda approach is one.

        "Let’s just move on, treat everybody with firmness, fairness, dignity, compassion and respect. Let’s be Marines." - Sgt. Maj Michael Barrett on DADT repeal

        by kyril on Wed Aug 28, 2013 at 05:26:32 PM PDT

        [ Parent ]

        •  I continue to be amazed (0+ / 0-)

          At how much attention people spend on their appearance.  

          I've been washing my hair variously with shampoo and bars of soap for decades.  I notice no discernible difference between the two.

          I recognize that with hard water, soap may leave a residue.

          But not everywhere has hard water (i.e., water with a preponderance of divalent metal ions, such as calcium and magnesium).

          It's amazing the trouble people go through to wash their hair.

          Literally amazing.

          You'd think they would have more pressing concerns.

          Evidently not.

          •  I'm assuming by your name (0+ / 0-)

            that you probably have short hair. I do too now, and I can wash with pretty much anything, including plain water.

            Long hair is tricky, though. Especially for women (given the asymmetrical gendered expectations for appearance), and even more so for women with curly hair.

            "Let’s just move on, treat everybody with firmness, fairness, dignity, compassion and respect. Let’s be Marines." - Sgt. Maj Michael Barrett on DADT repeal

            by kyril on Thu Aug 29, 2013 at 11:13:49 PM PDT

            [ Parent ]

    •  Love Paula! I trust her much more than industry (0+ / 0-)


      "real" work : a job where you wash your hands BEFORE you use the bathroom...

      by chimene on Wed Aug 28, 2013 at 08:37:19 PM PDT

      [ Parent ]

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