[halrac]

Thank you both very much! 

[halrac]

Hi everybody,

I like to keep you updated with my progress (it is also a way to show you my gratitude for all your help).

I made a new batch 3 weeks ago and it turned out perfect (at least, from my point of view).

This is the new recipe:

Distilled Water                     20g
L-Ascorbic Acid                   4g
Glycerin                               1%
Ferulic Acid                          0,5%
Sodium Hyaluronate (RMW)  0,2%
1,3-Propanediol                   20%
Green Tee Extract                 1%
Sodium Lactate                     6%
Citric acid                             q.s.
Xaromix                                1%

I added sodium lactate as MarkBroussard suggested, added the L-Ascorbic Acid last and used xaromix as opposed to Geogard Ultra (dissolving it properly is almost impossible for me).

I believe that, due to addition of the sodium lactate, my final pH was around 4, so I decided adding a little bit of citric acid. I was hesitant at first as I did not know if the final product would be too harsh on my skin, but after giving it some thought and do some research, I went for it.

The serum is really nice, up until today there is no visible oxidation and the “filaments” are now history.

In order to make things a little bit more complicated I was thinking of adding disodium EDTA next time as a chelator. Any thoughts?

Edit: Formatting

[halrac]

Hi Maes! Thank you very much for your reply.

At one point, I studied the possibility of using Microcare SB, problem is the recommended pH is 4-6 and my serum, in order to be effective, needs to be 3.5 or lower.

On a different note, I do not why, but when I saw you your profile photo I though: “That girl looks Spanish!”.

Greetings from Málaga!

[halrac]

Hi Belassi! Yes, it happens with both preservatives.

Hi MarkBroussard! The Xaromix is liquid but I will
add the sodium lactate as indicated and add the ingredients in the suggested
order.

Hi Doreen81! I read somewhere that using metals when
ferulic and/or L-ascorbic were involved in a formula could be an oxidizing
fact. The first time that I tried making this serum I used a milk frother whisk
to mix the ferulic acid with glycerin, and when I added the ascorbic acid, I immediately
saw it crystalizing.

With regard to the pH, mine was 3.5 when I last made it.

I am afraid that I do
not run any microbiological test. I make small batches and they last one month
approximately. I do not sell this serum or anything like that, it is for
personal use.

Hi DRBOB@VERDIENT.BIZ, though I am going to keep on
trying using the L-ascorbic acid, I have a formula with sap that I may try in
the future.

Thank you all very much for your help! I have taken very good note of
everything that you have said and I will keep you updated with my progress!

[halrac]

I was wondering if nobody is replying because this is a silly question or because you need more information…

[halrac]

So… I have tried the formula twice and have encountered several problems (why am I not surprised…), not because of @MarkBroussard formula, but because of me.

First, the ferulic acid would not solubilize in glycerin, I tried the second time with 1,3-Propanediol and that did work. I had also had problems when incorporating the hyaluronic acid, so the second time I included it once it had soaked in water for a while.

I had also problems dissolving the ascorbic acid (I should have used a fine milled one).
 
In order to make this even more horrible, I decided to add some vitamin e (1% mixed tocopherols) dissolved in polysorbate 80 (1%). It turned milky white. The geogard ultra did not dissolved completely in water and I threw it all down the drain.

Next time, I will buy ultrafine ascorbic acid, dissolve the geogard in some glycerine instead of water and forget about the vitamin e.

I just wanted to share my experience with you sou you could have a good laugh at my expense

By the way, @Belassi, I got some Pycnogenol but it turned into mud…  :#

[halrac]

I do hope it works!!

In any case, I am waiting for the Pycnogenol to arrive (as Belassi suggested).

I will keep you updated..

[halrac]

Once again, thank you!

[halrac]

Wow… You are amazing. I am so sad that I did not have a good chemistry teacher in school and always hated it… :#

[halrac]

One last thing Belassi… If I was able to find the Pycnogenol (I am quite stubborn), what would be the right percentage for my recipe?

[halrac]

Green tee is easier to get.

Thank you very much for your generosity!

[halrac]

Hi Belassi!

Thank you very much for your suggestion. Unfortunately, I can only find L-Resveratrol and Pycnogenol as oral supplements

[halrac]

Hi DRBOB@VERDIENT.BIZ!

Thank you for your prompt reply. I thought mixing Sodium
Benzoate and Vit. C was also not a good idea…