BiochemiaUrody - Strona Barbary Kwiatkowskiej (TYLKO-DO-ODCZYTU)

[BasiaKwiatkowska]

jollyz
Wysłany: 07 Kwi 2005 02:28 am Temat postu: Cera nadwrażliwa - kwas borowy?

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Basiu, czy przy cerze skłonnej do podrażnień to dobry pomysł aby przemywać ją kwasem borowym zamiast tonikiem?
Justy zasugerowała, że może być toksyczny. No i już nie wiem, czy dobrze robię. A co w przypadku maści recepturowych z dodatkiem kwasu borowego? Czy można używać stale ?
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justy

Wysłany: 07 Kwi 2005 09:38 am Temat postu:
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pytanie doty. tego wątku:
[link widoczny dla zalogowanych]

kwas borny (borowy) działa ściągająco, wysuszająco i słabo antyseptycznie.
kwas borowy łatwo wchłania się z błon śluzowych i przez uszkodzoną skórę. Jest bardzo powoli wydalany z moczem; może się kumulować, (zwłaszcza u dzieci-nie mozńa go używac do 11 r.ż) Stosowany długotrwale - zwłaszcza na duże powierzchnie ciała, a także u dzieci - kumuluje się i wywiera działanie toksyczne, uszkadzając nerki, o.u.n. i wątrobę.
stosowany jest w stanach zapalnych skóry albo jako środek konserwujacy w preparatch recepturowych (czasami)
jeśli skóra jest "tylko" sucha, wrażliwa, atopowa, bez zmian zapalnych- kwas borny nie przyniesie jej żadnych korzyści, a nadużywany- zaszkodzi.
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Basia
Site Admin

Wysłany: 07 Kwi 2005 09:46 am Temat postu:
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Dzieki Justy.
Ja jeszcze tylko dodam wyniki badan nad kwasem borowym i boraksem czyli sodium borate - sol sodowa na bazie kwasu borowego (ang)

[The INCI name for Borax is Sodium Borate]

The Spa Index wepage says that "Borax is a natural ingredient, and acts as both an antiseptic and a preservative".

Because Borax is natural does not mean Borax is harmless.

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What Is Borax?
[link widoczny dla zalogowanych]

Risks Associated with Borax

Borax is natural, but that does not mean it is automatically safer for you or for 'the environment' than man-made chemicals. Although plants need boron, too much of it will kill them, so borax can be used as an herbicide. Borax may also be used to kill roaches, ants, and fleas. In fact, it is also toxic to people. Signs of chronic toxic exposure include red and peeling skin, seizures, and kidney failure. The estimated lethal dose (ingested) for adults is 15-20 grams; less than 5 grams can kill a child or pet. For this reason, borax should not be used around food. More commonly, borax is associated with skin, eye, or respiratory irritation. It is also important to point out that exposure to borax may impair fertility or cause damage to an unborn child.

Now, none of these risks mean that you shouldn't use borax. If you do a bit of research, you will find risks associated with all cleaning products, natural or man-made. However, you do need to be aware of product risks so that you can use those products properly. Don't use borax around food, keep it out of reach of children and pets, and make sure you rinse borax out of clothes and off of surfaces before use.
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Final Report on the Safety Assessment of Sodium Borate and Boric Acid
Journal of the American College of Toxicology Vol: 2 Year: 1983
Sodium borate and boric acid are used in cosmetics as preservatives, antiseptics, water softeners, pH adjusters, emulsifiers, neutralizers, stabilizers, buffers, or viscosifiers. Investigators have reported that sodium borate and boric acid are poorly absorbed through intact skin; however, both compounds are absorbed through abraded, denuded, or burned skin. In a 90-day dermal toxicity study, boric acid (25-200 mg/kg/day) was nonirritating and nontoxic when applied to the intact skin of rabbits. Sodium borate and boric acid were relatively nontoxic when tested orally in animals. A 5% sodium borate in water solution was mildly or moderately irritating to the skin of rabbits and guinea pigs, and practically nonirritating when instilled in rabbit's eyes. Acute studies indicated that, at 10% in water, boric acid was mildly or moderately irritating to the skin of rabbits and guinea pigs. Sodium borate or boric acid in the diet of rabbits and rats caused growth retardation. Doses of up to 1.06 g/kg/day sodium borate in the diet of male rats exerted toxic effects on the gonads as well as infertility. Boric acid was nonmutagenic in the Ames test. Boric Acid induced reduced eye phenocopies and lumpy chromosomal inclusions in drosophila melanogaster. Limited carcinogenic and teratogenic studies did not indicate a statistically significant effect. In clinical studies, cosmetic formulations containing up to 3.2% sodium borate were nonirritating to moderately irritating and nonsensitizing when applied to human skin. Formulations containing up to 2.4% boric acid were moderately irritating and practically nonirritating. Photopatch testing of formulations containing 1.1% or 1.7% sodium borate were negative. Based on the increased absorption of boric acid by damaged skin as compared to intact skin, as well as the testicular atrophy observed in experimental animals, the panel concluded that sodium borate and boric acid, in concentrations < 5% are safe as cosmetic ingredients when used as currently recommended; however, cosmetic formulations containing free sodium borate or boric acid at this concentration should not be used on infant or injured skin.

Wynika z tego, ze stale uzywanie preparatow opartych na kwasie borowym nie jest wskazane i nie moze byc szkodliwe.

the Cosmetic Ingredient Review's (CIR) Expert Panel's "Cosmetic ingredients found safe, with qualifications (388 total, through December, 2004)" - [link widoczny dla zalogowanych]

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Health Canada's Cosmetic Ingredient Hotlist - December 2004
[link widoczny dla zalogowanych]

Sodium bromate (7789-38-0)

* The inner label and the outer label of a cosmetic product, in liquid form, that contains an amount of sodium bromate equal to or greater than 600 mg must carry a statement to the effect of:

o "This product contains sodium bromate, is poisonous, and is to be kept out of the reach of children. In case of accidental ingestion, a Poison Control Centre or physician is to be contacted immediately."

* Cosmetics containing sodium bromate must be packaged in a child-resistant container, according to part 4 of the Consumer Chemicals and Containers Regulations as they read on September 30th, 2001.