I would say it's quite likely that all brands of glue, even those approved for use on human skin, contain toxic chemicals that are released systemically, albeit in small amounts. In chemistry, they say that the dosage always makes the toxin. The question is not whether glues contain toxins - which they no doubt do, along with dyes, shampoos, and most other hair accessories - but which toxins and at what concentration, as well as whether or not they build up in the body over time.

For example, sodium laurel sulfate is a surfactant and foaming agent used in nearly every bathroom product. It's also applied to the skin of labrats to induce cancerous lesions. The reason benzoyl peroxide works so well against acne is because it generates a tsunami of free radicals to kill the bacteria in your pores. The same can be said of chlorine, a powerful oxidant in your drinking water. You just happen to be able to deal with the assault alot better than microorganisms can.

I wouldn't be surprised if certain ingredients behaved as endocrine disruptors or caused low-grade systemic inflammation. You just have to decide whether any of this is worse than being bald. Personally, I don't care to be a shining model of health if I can't even enjoy my life or feel good about myself because I'm ugly. My well-being is also an integral part of my health. None of us is going to live forever, but many of us are willing to take risks to live the happiest lives we can.

I once wrote a story about an elderly lady who took great pains throughout her life never to set foot in the sun, so as to preserve the youthfulness of her skin. On her deathbed, a young nurse marvels at her beautiful and luxuriant skin. How do you think the dying lady feels? Do you think she gives a damn about her beauty, or does she regret never having taken an afternoon stroll in the park, etc.?