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Hello, Beauty Brains.
I have a quick question about rosehip oil. As I understand it, this oil contains a form of vitamin A that is a bit like a natural version of a retinoid. Does this mean that if one uses the oil (or a product containing this oil) on the face, it should only be used at night in the same way as a retinoid?Many thanks in advance,Tracey.It is being said on some websites it contains about 0.04% all trans retinoic acid (Vitamin A) and about 0.2% ascorbic acid (Vitamin C). I don’t know if its true, but then it would be a very high amount of vitamin A. However there have been studies which couldn’t find any vitamin A in the oil. Although another study found cold pressing the oil may preserve the vitamin A, which was present at around 0.35mg/L (0.000035%) (link). According a post on this blog it’s about 0.0001%, also stating that the low concentrations is the reason some studies can’t detect the vitamin A (link).
@Peter Rosehip plant may contain Vitamin C but Rosehip oil contains NO Vitamin C! There has been controversy on this.
Vitamin C is only present in the fresh fruit.“My research and inquiries in various institutions (including the German Society for Fat Science, the Faculty of Nutritional Sciences of the University of Hohenheim and a specialized oils chemist) confirmed that in the fatty oils have no significant amounts of water-soluble vitamins and it is a transmission error of the ingredients rosehip oil on the handle, the going ever since, and reproduced from source to source further (be like other oils, which levels of vitamin C or those of the B-series rumored)”@Tracey, i was just discussing Rosehip oil with Peter on this forum threadRosehip oil should not be used in the day!!
Rosehip contains betacarotene, a precursor of trans-retinoic acid and trace amounts of retinoic acid like Peter said.The reason why Rosehip is not suitable to be used in the day is not just the Vitamin A it contains but also because it is highly oxidative unstable. Oils strongly susceptible to oxidation such as rosehip, evening primrose, pomegranate oil and other oils with parts of α and γ-linolenic acid and high linoleic acid (e.g. hemp, elder, currant and other seed oils).This German website specialise in oils teaches us not only is the use of sunscreen important in the fight against aging , but also which oils one uses during the day. They have a list of oils with very detailed information. Unfortunately it’s in German (i use chrome to translate).if you are keen, i have done quite a bit of research on facial oil and in particular rosehip oil, you may read this post.@Tracey I would not use pure rosehip oil in the day. however i am not sure if it is ok to use a product containing a small amount of rosehip oil in the day. i think to play safe, i will avoid rosehip oil in any product for day time use. i certainly have seen a huge number of brands using rosehip oil in their products for day time use! if i really really like the product and rosehip oil was in small quantities, i think i can overlook it. Ideally, no oxidative unstable oils for daytime use!
This may be helpful: http://thebeautybrains.com/2015/01/is-rose-hip-oil-good-for-anti-aging/
@RandyS Excellent link! *off to check it!*
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