- une réduction des taches brunes et des ridules,
- luminosité accrue, lissage général,
- et même des améliorations notables pour des affections cutanées comme le psoriasis.
Si vous nous suivez depuis un certain temps, vous savez que je (Steve) suis un peu sceptique quant aux allégations en matière de soins de la peau, mais les sérums à la vitamine C contenant 10 à 20 % d'acide L-ascorbique semblent être un choix assez sûr pour obtenir les bienfaits mentionnés ci-dessus et, dans certains cas, celui-ci : 
Mais voilà le hic. Personnellement, j'ai remarqué qu'il faut faire très attention à ce que le produit ne se gâte pas (par exemple, en le conservant au réfrigérateur avant utilisation).
Vous saurez qu'il est périmé lorsqu'il deviendra brun foncé.
Pour compenser la volatilité, nous avons ajouté de la vitamine E (Le tocophérol est le nom chimique) et nous le conservons dans des bouteilles noires opaques, mais nous envisageons également l'ajout d'acide férulique, considéré comme la référence en matière de conservation.
Mais l'acide férulique a une odeur désagréable. Comme l'eau de cuisson des hot-dogs. Et nous ne pensons pas que ce soit une bonne idée d'ajouter des parfums pour masquer cette odeur.
Voici donc ma question :
Votre sérum etee est-il périmé ? Si oui, depuis combien de temps ? Remarque : une coloration jaune à orange est normale, mais une fois qu’il devient orange foncé ou brun, cela signifie qu’il n’est plus efficace.
Seriez-vous prêt(e) à accepter une odeur de hot-dog si cela signifiait que le sérum durait plus longtemps et était mieux absorbé ?
Faites-le-moi savoir dans les commentaires ci-dessous...
Et CLIQUEZ ICI si vous souhaitez en savoir plus sur notre sérum à 15 % de vitamine C.
commentaires
My vote is to keep it as is.
Leave it as is!!! I don’t think it’s worth the extra chemicals and fragrances.
No bad smell. At the end of the end, it’s a cosmetic product, which people should enjoy wearing, and if it has a bad scent, they will eventually stop using and replace it with something else, results or not. Dark bottles wouldn’t deter me from using a product. We already have a lot of products without see-through containers.
I can’t tell you how much I love your products. I’m a big fan and use many of them! But, you’re probably not gonna like my comment. I really believe the very best thing you can do about Vit. C is to use a different formulation that is more stable (and also works just as well), and don’t use a dropper container. From everything I’ve read and researched, the dropper is one of the worst kinds of containers because every time you use it, you expose the whole bottle to oxygen (which is a no no:). I realize that you want to be plastic free, and I want you to, too, because I LOVE this about your company!! So maybe work on another kind of container that only puts out the amount that you need, like some kind of pump? May not be possible, but a challenge, none the less. Also, there is a formulation that is just as effective as L-ascorbic acid and is also stable, and that is TETRAHEXYLDECYL ASCORBATE. Thanks for reading, and good luck with your decision. I’m very grateful that you ask us for our opinions about things like this – just one more way your company is so different (and better) than others!
I would be willing to try the ferulic acid if it made the shelf life longer and the smell goes away in a short amount of time like 15 min. Taking the extra step to keep it in the fridge is too much.
Like the other commenters suggested, having smaller bottle sizes or using essential oils to mask the smell could be potential options.
Good luck!
I haven’t tried your Vitamin C serum yet but I prefer fragrance free products.
Leave out the stinky hotdog water and continue with the opaque glass bottle. I’d rather refrigerate it than have added ingredients or fragrance. For many of us, fragrances are irritants to our skin. Thanks for making great products!
Hi Steve, I love your Vit C serum, I’ve been using it for several months and have definitely noticed a difference in the dark spots on my face. The bottle I just finished had turned orange (not brown) after 2-3 months. If the ferulic acid smell is very strong, my vote would be for the dark bottle and vit E. If the smell is mild, then I personally wouldn’t object to using it with the ferulic acid added.
If you go for the ferulic acid, then I suggest including a note with the item telling customers what the smell is and why it’s there. If you don’t make any changes to the formulation, then I think info about Vit C oxidation is important to put on your website so customers are aware of it before purchasing. I didn’t know that it loses its effectiveness when it turns orange, and I tend to stock up on items when they’re on sale. Now that I know the Vit C shelf-life is short, that’s one item that, in future, I’ll buy only as much as I need at that time. Also knowing that storing it in the fridge before use would be helpful to know at the time of purchase and/or when the item arrives.
Thanks for a great product!
I have not had a problem with your current formula so I would keep things the way they are.
Please leave it as it is. Do not add fuerlic acid (dirty hot dog water smelling chemical) OR other fragrances to cover stink. I agree with person who said if used daily it won’t darken and lose its efficiency.