Dont do Henna in winter

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And how is it supposed to get into the blood stream when it's applied to the hair?
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If the "henna" powder is contaminated with lead, some of the powder can accidentally be inhaled. When lead is inhaled, it enters the lungs, and then it can enter the bloodstream.

According to the sources I found, lead really can't be absorbed through skin, but chronic exposure increases the chances of some absorbtion. Lead can enter into the body through open wounds, like cuts or abrasions on the scalp. Other bacteria/pathogens definitely can enter the body through the skin, especially through wounds, and cause sepsis.

"Henna" (the stuff that's not really pure henna) that contains PPD is known to cause severe allergic reactions, particularly if used on skin. According to this book, pure Henna is not the cause of these documented problems: Clinical nephrotoxins: renal injury from drugs and chemicals - Marc E. De Broe, William M. Bennett, George A. Porter - Google Books

So the possible toxins could be PPD, Lead, both, and possibly other things. In any case, it's henna with additives that cause the problem, not pure, lab-tested, body art henna powder.
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If the "henna" powder is contaminated with lead, some of the powder can accidentally be inhaled. When lead is inhaled, it enters the lungs, and then it can enter the bloodstream.

According to the sources I found, lead really can't be absorbed through skin, but chronic exposure increases the chances of some absorbtion. Lead can enter into the body through open wounds, like cuts or abrasions on the scalp. Other bacteria/pathogens definitely can enter the body through the skin, especially through wounds, and cause sepsis.

"Henna" (the stuff that's not really pure henna) that contains PPD is known to cause severe allergic reactions, particularly if used on skin. According to this book, pure Henna is not the cause of these documented problems: Clinical nephrotoxins: renal injury from drugs and chemicals - Marc E. De Broe, William M. Bennett, George A. Porter - Google Books

So the possible toxins could be PPD, Lead, both, and possibly other things. In any case, it's henna with additives that cause the problem, not pure, lab-tested, body art henna powder.
Originally Posted by gardencurls
Thank you
I agree with you Sayoon. I am Pakistani and we have always been told henna is cold which means it has a cooling effect on the body and should not be used in the winter. I had been out and had cold symptoms to begin then, then foolishly used henna thinking I'd be ok in a warm house. I have had crippling headaches since. I have been in bed for most of yesterday and last night. I found some relief by wearing a woolly hat. The headaches are coming and going and even right now when it's not there, my head still feel sore.

Please listen to Sayoon everyone. She knows what she's talking about. Ancient wisdom warms against using henna in cold weather. If I find out a way to counteract this harm, I will post it God willing.
Black henna isn't indigo. Indigo is a natural product.

I've applied henna in winter with no side effects. However I live in a heated place and don't go out with henna on my head.

The medical side effects I've read with normal henna are that it cause cell mutation.

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