Home Cosmetic Science Talk Formulating Skin Bad skin lesions - preservatives?

  • Bad skin lesions - preservatives?

    Posted by Belassi on May 2, 2017 at 7:44 pm

    Hartz “Groomer’s Best” shampoo for dogs “Extra Gentle Soothing Oatmeal”
    LOI: water, SLES, acrylates copolymer, CAPB, colloidal oatmeal, PEG80 sorbitan laurate, amidopropyl amine oxide, sodium hydroxide, perfume, polyquaternium 11, EDTA, panthenol, hydrolysed silk protein, DMDM hydantoin, methylchloroisothiazolinone, methylisothiazolinone,

    Decided to use a commercial shampoo on my two Springer Spaniels neither of which have had problems before. Within a day or so both dogs came out in horrible skin lesions. Took weeks to heal (I changed back to using my own somewhat expensive sulphate-free shampoo).
    Since then I have come across another case, same problem, another Hartz shampoo.

    It seems likely to me that the last two or three preservative components are the probable cause. (My own shampoo uses nothing more than sodium benzoate)

    Your opinions are invited.

    UPDATE: Looking around the Web I see that Hartz is the subject of MANY complaints.

    johnb replied 6 years, 4 months ago 5 Members · 7 Replies
  • 7 Replies
  • bill_toge

    May 2, 2017 at 8:29 pm

    I suspect the amine oxide may be a causative factor too, as they’re not gentle surfactants; in the UK at least, their usage is generally limited to household products


    May 2, 2017 at 8:55 pm

    What an overkill on preservatives-DMDMH is a formaldehyde releaser  with isothiazolinones particularly methylchloro analog would be very suspect.Sounds like contact dermatitis?sorry for your dogs.

  • johnb

    May 3, 2017 at 7:10 am

    I agree.

    I have not, nor ever would I, use DMDMH or thiazolones in anything at all - not even drain cleaner.

    The sensitising potential of Kathon (thiazolone) preservatives was known at the time of their introduction in the late 1970’s early 80’s.  Rohm & Haas who introduced the products brought them on to the market seemingly in the hope that their very small in-use concentration would allay any fears of adverse effects.

  • Belassi

    May 3, 2017 at 7:53 pm

    I have sent a consumer complaint to them so we’ll see what they say.

  • manstra

    May 3, 2017 at 10:29 pm

    My personal opinion is that it is contact dermatitis if after a few minutes or hours you see the rushes on the skin. I would avoid using products with thiazolines on pets generally. These preservatives are more suited in houseclean products due to their sensitizing+accumulating effect. @jonhb DMDM hydantoin is generally unsafe if used over 0.6% and can also cause serious skin irritation. For DMDM hydantoin I always trust Lonza’s Glydant 2000 where I never had issues because the free Formaldehyde is lower even in the final products and in most cases is sufficient at 0,4% active (0,8% as Glydant)

  • Belassi

    May 4, 2017 at 4:08 am

    Presumably it is not the FDA one complains to, in the case of a pet product. Anyone know which agency in the USA?

  • johnb

    May 4, 2017 at 6:42 am

    manstra Please don’t think I was endorsing the use (or acceptablility) of DMDMH. I can see that my contorted use of English may have suggested that I was.

    What I meant was that I would not use DMDMH (or any other formaldehyde derived/releasing product) nor would I use any thiazolone containing preservative under any circumstances.

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