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Lactic acid lotion/cream

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Lactic acid lotion/cream

Postby luvsfordpower » Thu Feb 05, 2009 12:14 am

I would like to make something to Amlactin - a 12% lactic acid cream moisturizer. I make lye soap & balms, but never lotion. How can I incorporate the acid? Ingredients in amlactin are below. Do you need all these ingredients for a decent lotion?

Sorry about typing...had surgery for carpal tunnel yesterday.

Active Ingredients: Lactic Acid 12%
Inactive Ingredients: Water, Lactic Acid Neutralized With Ammonium Hydroxide, Light Mineral Oil, Glyceryl Stearate, PEG-100 Stearate, Propylene Glycol, Glycerin, Magnesium Aluminum Silicate, Laureth-4, Polyoxyl 40 Stearate, Cetyl Alcohol, Methylparaben, Propylparaben And Methylcellulose.
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Postby DCNGA » Thu Feb 05, 2009 10:25 am

I use Amlactin too, on my arms. Never thought of making my own as I don't know that I could accomplish it--too much chemistry for my liking. Since lactic acid is not a true active, it would mean understanding a great deal more about chemistry than I'm willing to learn :lol: .

Perhaps Kylesmom9 will answer. She is our resident chemist-type.

If you guys come up with something, I'm willing to try.

Amlactin is a cream base with a consistency a little thicker than CeraVe lotion, so I'm thinking CeraVe lotion could be used as the base.

Of all the stuff listed, I'm thinking this is what is the most "active part" Lactic Acid Neutralized With Ammonium Hydroxide and what I don't know is if I could achieve the proper mixture to achieve a 12% solution on my own. I also don't have lactic acid--just glycolic and TCA.

If you do, the other ingredients are pretty superfluous and mixing the proper percentage of Lactic Acid Neutralized With Ammonium Hydroxide in the CeraVe, adding preservatives to cover the amount of Lactic Acid Neutralized With Ammonium Hydroxide added to the base, you could do it with that alone. But, that is a lot of assuming on my part.....
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Postby kylesmom9 » Thu Feb 05, 2009 12:22 pm

I looked around a bit...on the GOW forum Jen said that AHAs can be added to your favorite base cream and should be fine. If you would like, I have both CeraVe lotion (yay, I bought it this morning!) and 88% lactic at home. I can make a 12% by weight and give you the approx volumes (since you probably don't have a scale?) and also test the pH...I don't think it will be high enough to need the ammonium hydroxide, but I could be wrong.
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Postby DCNGA » Thu Feb 05, 2009 2:28 pm

You are so nice! I wish I had some lactic acid, I only have glycolic :? .

D
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Postby kylesmom9 » Thu Feb 05, 2009 3:18 pm

I made a tiny small batch (30g...about 1 oz) to see how it worked. The pH of Amlactin is 4.5-5.5 according to them. This is right in line with the natural pH of skin which means it is not irritating. If you mix 88% lactic (that is typically what you find for purchase) with CeraVe in the below amounts you will get a 12% lactic lotion with a pH around 3 to 4. I tried it on my arm and there was no stinging...it has been over an hour and no issues...no pink nothing. (pH 2.5 + is safe for a leave on product.)

So this is a true 12% solution not 12% of an 88%...in other words I did the math. :lol:

Ingredients:
2.5 tsp 88% lactic acid
1/4 cup + 2 tsp of CeraVe or preferred base lotion
3 big drops germaben or 6 small ones (if you have one of those 1 ml droppers it is 6)

If you don't have the germaben or other suitable preservative, then just make small amounts and use quickly (and don't stick your fingers in the jar!) Recipe can be doubled and possibly tripled but don't go further than that...since I rounded some numbers the percents could get off by multiplying TOO much. :wink:

I used a mixing boat, but a small dish with a stirring stick should work fine to make sure it is mixed well before putting it into a container.

Luvsfordpower~ if you make this could you write back and compare to your Amlactin? I have never used it so I can't say whether it will perform the same, though it seems like a nice lotion anyhow.

:)
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Postby DCNGA » Thu Feb 05, 2009 4:38 pm

Image DCNGA is sitting at the keyboard, repeating silently:

I will not order lactic acid UNTIL I am out of Amlactin
I will not order lactic acid UNTIL I am out of Amlactin
I will not order lactic acid UNTIL I am out of Amlactin
I will not order lactic acid UNTIL I am out of Amlactin
I will not order lactic acid UNTIL I am out of Amlactin
I will not order lactic acid UNTIL I am out of Amlactin
I will not order lactic acid UNTIL I am out of Amlactin
I will not order lactic acid UNTIL I am out of Amlactin
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Postby kylesmom9 » Thu Feb 05, 2009 4:45 pm

I thought about telling you all the good sources to get it cheap, but that just makes me an enabler. :lol:


Love that smily.
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Postby ouch! » Thu Feb 05, 2009 7:49 pm

Hey everyone!

Terri, I'm just curious why an additional preservative is needed since the Cerave would contain one? I have some Amlactin that I added a little extra lactic to and (I think) it is fine. I'm guessing you are just exercising an abundance of caution, but am curious.

Thanks and hope everyone on the east coast is surviving this freezing weather...brrrrrrrrrrrrrrrrrrrrrrr!
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Postby kylesmom9 » Thu Feb 05, 2009 8:34 pm

Yes, just exercising caution. :) Lactic acid is itself a preservative against bacteria, but not so good against molds from what I understand.

The trouble is we don't know what level the amlactin (or cerave, etc.) has...and when you dilute you may not have a level that is adequate to prevent contamination. I wouldn't worry for small amounts, but say you made 12oz of a face cream that took you a year and a half to finish...I WOULD worry about that!

I don't add extra preservatives to my niacinamide cream, but I make a batch about every two weeks.

Sorry you guys are cold...yesterday was almost 70 here and we were outside enjoying the nice weather. Wish we could share! :)
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Postby DCNGA » Fri Feb 06, 2009 6:27 am

I don't know about the lactic acid, molds, preservative, etc. But, for me I add a preservative when I add water (even drops) to dilute something. So, if I were making a serum using the CeraVe lotion and diluted it, I would still want enough preservative to cover the drops of water I added.

I'm glad you said something about the LA and molds, I will definitely use a preservative if I make this cream.

Thanks again, Terri.

BTW, too bad you don't live out AZ way, Hannah has been looking for a lab assistant for months. You would be perfect!!

Off to work.........
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Postby kylesmom9 » Fri Feb 06, 2009 8:26 am

D you are right about the water! Water activity is a huge predictor of contamination...I remember that from food chemistry. The lactic acid is 12% water, so that is my concern there... though if you are using it up fast it is probably fine.

I don't have much concern for adding powdered ing. to an already preserved base.

OOOOO a lab assistant in a place with all the actives I can imagine...isn't that a dream come true! :D
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Postby DJC7 » Mon Mar 09, 2009 7:24 pm

Did anyone end up making there own lactic acid cream/lotion?

Amlactin's is quite greasy...I wish it wasnt.

Kylesmom, was your cerave/lactic acid lotion greasy and sticky?

Also what was the consistency like? Cerave lotion is quite runny to begin with and adding a serumy lactic acid would just make it even runnier.

PS. What is the GOW forum?
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Postby kylesmom9 » Tue Mar 10, 2009 6:44 am

Hi DJC7,

No it isn't greasy or sticky, but it does smell like the lactic...a bit on the sour side. It feels nice on the skin, and keeps the moisturization in for a long time.

It's not runny...the lactic is a little on the thick side, so it's not like adding water, and you don't add that much. It's still definitely a lotion.

GOW= Garden of wisdom :)
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Postby DJC7 » Thu Mar 12, 2009 1:25 am

thanks kyles mom :D

Have you ever used Amlactin before?
If so how would you rate your Cerave/Lactic Acid compared to it?

Also, do you find you have to shake up the lotion before each use, as the lactic acid is seperating from the cerave lotion?

And lastly, where do you buy your lactic acid from??
And where do you buy you germaben from?

sorry for all the questions :oops:

take care :)

PS. Last question I promise :roll: lol...but how do you test the pH of your lotion?
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Postby kylesmom9 » Thu Mar 12, 2009 7:58 am

Hi DJC7,

I haven't ever used Amlactin...so I can't compare. There has been no separation since I made the lotion; I don't have to shake. I would make sure you mix in a bowl or cup with a stirring stick as opposed to shaking all the ingredients together in a bottle. That way you can ensure things get mixed completely in the first place. It DID take some time to mix it well.

DJC7 wrote:
...where do you buy your lactic acid from??
And where do you buy you germaben from?


I buy germaben II and lactic from lotioncrafter.

DJC7 wrote:...how do you test the pH of your lotion?

I use pH strips from a chemistry store online. Those you can buy anywhere, just make sure they are the kind that go from 1 to 14. I find the ones with the little squares stuck on a plastic stick are better than the orange paper. It is an approximate pH of course. In other words you can tell if it is a 2 or in between a 2 and a three or a three, but you can't tell if it is a 2.5 vs a 2.7. :) Good enough for our purposes. I found them on Amazon from Fisher Scientific. [/quote]

HTH :)
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