[Ronit]

So what is the conclusion? 

Is there a site/table that show how
to calculate the percentage of ascorbyl
palmitate (or any oily vit C) with regard to AA?

How much AP do I need to add if AA is 15%, 16% and 17% ?

Further to what you write
here – 30%  small molecule 70% large molecule,
is it still penetrate
the skin and do the same work as AA do ?

[Ronit]

ngarayeva001 said:

96%… I heard controversial opinions about tetrahexadecyl ascorbate. Some papers suggest it works but the sample is too small. I used 10% for a couple of months (made it myself, I don’t think you can buy it at a such concentration) and didn’t notice any difference.

You use 10% ? If its equivalents to 96% why you do that? or you didn’t know?

Perry said:

@Ronit - what do you mean by “effective serum”?  What claims are you making about it?  How do you determine that the serum is effective?

Effective mean: antioxidant, skin firmness, protect from free radicals, minimise wrinkles signs, photo protective etc
It is poss to get that by 10%-20% of vit C (and as I understand yesterday, these percents are for ascorbic acid)

chickenskin - I read it later (with the links)

[Ronit]

Intresting….Thanks alot

so if I want effective serum and equivalents to 15% ascorbic acid, Its enough  to add 2.3% ascorbyl palmitate or its better 3%?

[Ronit]

MarkBroussard - they write 20% THD Ascorbate, 2% Ferulic Acid and 3% Vitamin E. the vit C is Tetrahexyldecyl Ascorbate.
 Do they put from that only 6.4% (if it equivalents to 96%)?

[Ronit]

Sorry for the misunderstanding, but I hated the Ascorbyl palmitate with oil to 85 degrees. When phase A has cooled down (40 degrees) I add phase B (water,
lecithin, etc). In fact, I made the amount of 3% because 15% is just impossible.

Of course with 15%  Ascorbic
acid there is no problem to melt it, but everywhere I read about making vitamin
C serum ,and if I want it will be effective,
they recommend it contain 15%-20% vitamin C. As Ascorbic acid is unstable,
every one use oily derivatives
of vitamin C .

I even looked the ingredients list for companies that sell  vitamin C serum, especially those who write that the product
contains 20% vitamin C. The result is that it always contain one of the oily derivatives.

So if it’s the oily derivatives do I need to use 15% or less??