Just my 2 cents: If you are going to use l-ascorbic acid powder, I'd use it
at night, because as Angie said, it oxidizes quickly, even more quickly in
light. You can end up with an unsightly orange hue on your face (ask me how
I know!). But, l-ascorbic acid powder is extremely cheap, while the more
stable water-soluble versions (magnesium ascorbyl phosphate is one) are much
more expensive. Still, cheaper than buying the expensive, stable,
high-potency serums like those from Skinceuticals.
Here's another option: make a silicone based serum with l-ascorbic acid.
Using a silicone base will keep the l-aa stable, because the l-aa will not
dissolve in silicone, but you will have more like a suspension of the l-aa
powder in the silicone base. I've made this using Monistat Powder Gel (or
the generic version of it), which is just a silicone gel (no medications or
drugs in this!) meant for chaffed skin. You could also buy the silicone
bases available from Lotioncrafters or others online. I bought ultra-finely
powdered l-aa from The Vitamin Shoppe online (it's called C-1000 I believe)
so that the suspension would be less gritty feeling. I made mine at about
10% and added vitamin E as well.
When you put the gel-serum on you skin, the vitamin C powder will slowly
dissolve in your skin's surface moisture, and slowly be absorbed by your
skin. This helps reduce oxidation issues. Also, since the serum is
waterless, you don't need to worry about using a preservative (though you
could add one that's good for anhydrous products). I didn't add a
preservative to mine, and just kept it in the fridge in a foil wrapped
container (still want to protect from light). Also, I still used it at
night, again, just to further prevent oxidation issues.
Tomara
On Fri, Dec 5, 2008 at 11:48 AM, <AngiesHerbarie@aol.com> wrote:
> In a message dated 12/5/2008 11:00:20 AM Eastern Standard Time,
> stodbosh3@verizon.net <stodbosh3%40verizon.net> writes:
>
> Like many others in the current environment, I am having financial
> difficulties and can no longer afford to purchase my Vitamin C serum.
>
> With a nod given to stability and effectiveness, could it be equally
> effective to add a vitamin c powder to a bland moisturizer as needed on
> a daily basis?
>
> I have concerns regarding making and storing my own concoctions.
>
> Any advice here is very much appreciated.
>
> Terri<<
>
>
> Dear Terri,
> Using Vitamin C in skin care products can be problematic whether you make
> them yourself or add the vitamin c to a ready-made product. You mention
> effectiveness, but it's not clear what kind of functionality you are hoping
> to
> achieve with vitamin c. If you are using ascorbic acid, you may be doing
> more
> harm than good for your skin since ascorbic acid oxidizes within
> hours/days.
> If you are using a stable form of vitamin c then you could add it to a
> "bland
> moisturizer" without concerns over oxidation, but once again, it could be
> problematic because of destabilization issues for the emulsion or even
> microbial issues. It may be fine or it may not be fine.
>
> If I were you, I'd forget the Vitamin C powder altogether - particularly if
>
> you are on a budget and don't want to waste time and money.
>
>
> Angie
> The Herbarie
> _www.theherbarie.com_ (http://www.theherbarie.com)
>
> .
>
>
>
[Non-text portions of this message have been removed]
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