There is very little ascorbic acid in rose hips. 
http://www.biochemj.org/bj/036/0336/0360336.pdf
Perhaps you should try a natural food source vitamin c extract powder like 
Madre-C from iherb.com. 



On Thursday, 27 February 2014, 4:20, Randy Parr <[email protected]> wrote:
 
I am new to the list and am curious if anyone has any experience using 
>herbs as the vitamin C source for liposomal vitamin C.  Specifically 
>rose hip powder and camu camu.  As an herbalist I avoid isolated 
>compounds.  I have made a batch of 1:3 ratio with rose hip powder and 
>had good results which tested for 75% encapsulation...but I'm having 
>issues calculating the exact amount of vitamin C in a tablespoon of rose 
>hip powder.  I am pleased with the results physically but would like to 
>know exactly how much I'm getting and if I need to add more.  Short of 
>contacting the manufacturer or heading to Jim Duke's NIH database and 
>trying to figure out the math from there, can anyone offer any 
>suggestions?
>R Lee Parr
>
>
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