> The male scalp excretes lots of testosterone which cannot be removed with just shampoo

Yes it can?

A detergent probably can. On that will be labeled as shampoo, which is intentionally gentle, to not remove too much oil from your scalp (which causes excessive oily hair, since it's regulated with a feedback system by the sebaceous glands), maybe not.

Both of you should provide evidence.

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emporas 6 days ago | parent | prev [-]

No it can't. Saliva has enzymes in it, enzyme means: "in life"-alive. Shampoo substances are dead, or chemical combinations which were never alive.

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Cthulhu_ 5 days ago | parent | next [-]

Enzymes are biological substances, but they aren't living organisms. Hence why they are in my dried powder detergent and the like.

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sva_ 5 days ago | parent | prev | next [-]

Enzymes are pretty common in laundry detergents and probably also shampoos.

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BizarroLand 5 days ago | parent | prev | next [-]

I think you are confusing testosterone and DHT (dihydrotestosterone), which is a testosterone derivative and is not testosterone itself. Shampoos that contain anti-DHT chemicals like minoxidil can block DHT from attacking your hair follicles but don't eliminate it from the body.

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TheCapeGreek 5 days ago | parent | prev | next [-]

By that logic any cleaning detergent also can't remove blood, sweat, or other bodily excretions from any surface?

	▲	fuckaj 5 days ago \| parent [-]
		And also by the same logic, chemical reactions in general are impossible outside of life. E.g. a fire.

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astura 5 days ago | parent | prev [-]

The word "enzyme" comes from the Greek words "en-" (in) and "zymē" (leaven), coined by German physiologist Wilhelm Kühne in 1878 from the German word Enzym.