If there were novacaine, I think one might notice a numbing of cuts or the skin or some such. An easy way to test this would be to rub a little onto your tongue. If it goes numb, then there's probably a numbing effect due to something in the product. Your toungue would be just as sensitive as eyes to a numbing agent and so would make a good bar for comparison. I have never noticed a numbing effect from this stuff, so I doubt that there's anything like that in there.
The PH explanation makes a lot of sense to me since this stuff still burns my eyes (always has). I have an unusually basic PH ballance, so if that's what's supposed to offset the burning, then that explains why it doesn't work for me. Also, one might think that they reffer quite casually to their extensive "clinical testing".
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The reason JOHNSON'SŪ shampoo formulas do not irritate the eyes is the mildness of the formulation, which has undergone extensive clinical testing and has proven to be as gentle to the eyes as pure water.
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This is Johnson & Johnson we're talking about, and that means the infamous bunny tests most likely. You better believe that they tested their formula thoroughly on animals. That wouldn't be necessary if they were using a known agent like novacaine.
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To assure their safety, the companies have an obligation to produce the mildest, gentlest products possible. This necessitates a minimum number of animal tests to demonstrate that new ingredients or new formulations are safe, prior to final validation in human tests, and to provide information required by physicians in emergency rooms and by poison control center personnel.
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http://www.jnj.com/community/policie.../statement.htm