Vilket UV-filter skyddar bäst?

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Källa: Marie Lodén – Ren, mjuk och vacker, tredje utgåvan, 2013, sid 198

Äntligen vår och hög tid att börja med solkräm!

Kanske är det inte bara jag som tycker det hettar lite i kinderna idag, efter en lång dag ute i solen? Vårsolen är så mycket starkare än man tror. Inte många vet att solen i Sverige så här års på sina ställen är lika starka som på Sicilien. En annan jämförelse som ger perspektiv är att solen i april är lika stark som i augusti. Ändå är det inte många som har börjat med solkräm än, fastän det är just nu man behöver den som bäst. Vinterblek som man är. Och helst ska man förstås undvika att använda fjolårets kvarblivna slatt. De flesta kosmetiska produkter har en ganska begränsad livslängd, ofta under ett år. När krämer blir gamla kan de ha sämre effekt och till och med bidra till oxidativ stress som bryter ner huden.

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Solkräm ska ge bredspektrum-skydd!

Solens strålar mäts i våglängd och anges i nanometer (nm). När man talar om UVA och UVB så menar man med andra ord ultraviolett (ej synlig) strålning i viss våglängd.

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UV-filter kan ge olika "brett" skydd

Vilken solkräm och vilken typ av UV-filter ska man välja? En solkräm kan antingen bestå av sk reflekterande (fysikaliska/"mineral"), absorberande (kemiska) UV-filter, eller en blandning av dessa två. Fysikaliska filter (t ex zinkoxid eller titandioxid) lägger sig ovanpå huden och reflekterar där bort solstrålarna så att de inte kan tränga in i huden. Absorberande UV-filter går däremot in i huden och absorberar där den energi som UV-strålningen alstrar. Många undviker solkrämer med kemiska UV-filter eftersom det finns misstankar om att vissa av dessa kan vara hormonstörande. Mer sällan talar man om UV-filter utifrån effekt. Skyddar fysikaliska och kemiska UV-filter lika bra? Faktiskt inte visar det sig. I alla fall inte om man jämför enskilda UV-filter med varandra. De skyddar nämligen olika bra över UV-spektrats olika våglängder. Inom Eu måste en solkräm skydda både UVA och UVB, dvs ha ett bredspektrum-skydd på kritiskt våglängd upp till minst 370 nm. För att uppnå den effekten måste man därför ofta kombinera olika UV-filter med varandra. 

Zinkoxid mest effektiva UV-filtret!

Av alla UV-filter är det bara zinkoxid som ensamt klarar att skydda huden mot alla tre former av UV-strålning: UVA (UVA1 och UVA2), UVB och UVC. Det har en kritisk våglängd mellan 340 och 380 nm. Som jämförelse kan nämnas att titandioxid har en kritisk våglängd mellan 320 och 340 nm. Det är samtidigt viktigt att tänka på att ett UV-filter i sig inte är en garanti för en effektiv solkräm. Det handlar förutom koncentrationer om hur produkten i övrigt är formulerad (komponerad). Samt självklart hur du själv applicerar produkten. De flesta tar bara hälften så mycket som man bör ta för att få det utlovade skyddet. Man måste också smörja flera gånger under dagen. Zinkoxid är än så länge förbjudet inom EU att använda som solskydd, fast många tror det kommer att tillåtas redan under 2014. Det går självklart att köpa solkräm med zinkoxid på många utländska webshoppar som tex:  Naturisimo, eller Iherb.

Amerikansk studie pekar på brister i bredspektrumskyddet

Sedan 2012 måste solskydd som säljs i USA vara bredspektrumskydd med en kritiskt våglängd på minst 370. I december 2000, innan den regleringen kom, publicerades en studie i Journal of The American Academy of Dermatology som visade att bara 10% av 59 undersökta solskrämer nådde upp till det skyddet. Kanske kan vara värt att tänka på när man shoppar solkräm i andra delar av världen, som t ex Asien? Där finns ett helt annat och mycket svagare regelverk. 

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UV-filter, effekt och typ av skydd

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Källa: "The Skin Cancer Foundation's guide to Sunscreens".

Tips på bra solkräm:

Aubrey Natural Sun SPF 30 Green Tea – Parfymfri och med antioxidanter, min solkrämsfavorit från förra året! Antioxidanter anses kunna ge ett extra skydd mot UV-strålningens skador i huden. Läs mer här.

Solskolan - mer läsning om solen!

 
Källa:

 

Kommentarer

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Jättebra inlägg, Mitte! :-)
Gillar alla bilderna som gör det överskådligt.
Ska länka till dig senare i veckan i ett inlägg jag gör om min jakt på solskydd.

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Mitte,

Tack Malin, du är bara alltför snäll! :) Kul med solkrämsjakt, ska bli kul att se vad du hittar!

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Tack för ett riktigt bra och informativt inlägg!

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Mitte,

Tack Lovisa för din fina kommentar!!  :)

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