皮膚科醫師:矽靈不但不會導致禿髮,還會讓頭髮看起來更加濃密!

為了印證這個論點,筆者也請太太與幾位病友分別用含矽靈與不含矽靈的洗髮精來洗頭,幾乎所有人都表示用含矽靈的洗髮精洗完之後,感覺起來的髮量較多,而且明顯不會乾澀。所以搞了半天,目前完全沒有任何證據顯示矽靈會加重禿髮。反而在某些讓頭髮變粗的洗髮精配方中,矽靈還有重要的角色。

寫到這裡,一定有讀者會說:「那只是剛好沒查到禿髮的證據,但其他部分不見得沒問題啊!」為了避免我們漏掉其他安全上的問題,筆者再拿dimethicone、cyclomethicone、safety(安全性)幾個關鍵字到NCBI網頁查,在國際毒物學期刊(International Journal of Toxicology)查到的結論都一樣:這些物質在現行的用法與濃度下都是安全的。(The Cosmetic Ingredient Review Expert Panel concluded that these ingredients are safe in the present practices of use and concentration.)[4][5]

順便一提,dimethicone還是一種衛服部核准的食用藥物(Gascon Tablet 40mg),現在還廣泛用來消除脹氣。這也是筆者當實習醫師時,這輩子第一次幫病人開出的處方藥。

因此,別再相信矽靈會傷害頭皮與頭髮的謠言了。這除了浪費大家時間去找尋無矽靈的產品外,也會讓頭髮更加乾澀,美觀上看起來更無優勢。

圖片提供:鄭煜彬 醫師

參考資料

1. http://zueei.com/beauty/bad-shampoo

2. http://www.fda.gov.tw/TC/newsContent.aspx?id=13466&chk=22734a27-05bb-4381-8ef6-5f3a7bf3892e&param=pn&cid=5049&cchk=55abc933-3e57-48db-afff-a8a4cc1e4ae0&scid=#.V5YTLEZ97C0

3. Br J Dermatol. 2011 Dec;165 Suppl 3:24-30. doi: 10.1111/j.1365-2133.2011.10633.x.
A novel cosmetic approach to treat thinning hair. 摘要原文:

BACKGROUND:
Many of today's treatments associated with 'thinning hair', such as female pattern hair loss and telogen effluvium, are focused on two of the key aspects of the condition. Over-the-counter or prescription medications are often focused on improving scalp hair density while high-quality cosmetic products work to prevent further hair damage and minimize mid-fibre breakage. Fibre diameter is another key contributor to thinning hair, but it is less often the focus of medical or cosmetic treatments.

OBJECTIVES:
To examine the ability of a novel leave-on technology combination [caffeine, niacinamide, panthenol, dimethicone and an acrylate polymer (CNPDA)] to affect the diameter and behaviour of individual terminal scalp hair fibres as a new approach to counteract decreasing fibre diameters.

METHODS:
Testing methodology included fibre diameter measures via laser scan micrometer, assessment of fibre mechanical and behavioural properties via tensile break stress and torsion pendulum testing, and mechanistic studies including cryoscanning electron microscopy and autoradiographic analysis.

RESULTS:
CNPDA significantly increased the diameter of individual, existing terminal scalp hair fibres by 2-5 μm, which yields an increase in the cross-sectional area of approximately 10%. Beyond the diameter increase, the CNPDA-thickened fibres demonstrated the altered mechanical properties characteristic of thicker fibres: increased suppleness/pliability (decreased shear modulus) and better ability to withstand force without breaking (increased break stress).

CONCLUSIONS:
Although cosmetic treatments will not reverse the condition, this new approach may help to mitigate the effects of thinning hair.

4. Int J Toxicol. 2014 May 26;33(2 suppl):65S-115S. [Epub ahead of print]
Safety Assessment of Dimethicone Crosspolymers as Used in Cosmetics.

5. Int J Toxicol. 2011 Dec;30(6 Suppl):149S-227S. doi: 10.1177/1091581811428184.
Safety assessment of cyclomethicone, cyclotetrasiloxane, cyclopentasiloxane, cyclohexasiloxane, and cycloheptasiloxane.

本文獲「鄭煜彬 醫師」授權轉載,原文出處

作者簡介_鄭煜彬 醫師

台北國泰綜合醫院皮膚科主治醫師

台北國泰綜合醫院植髮中心主治醫師

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