fareloz
Forum Replies Created
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Ferulic acid. Combination of AA + mixed tocopherols + Ferulic acid is very famous due to L’oreal Skinceuticals patent Note that they replace a lot of water with Ethoxydiglycol. The actual problem of AA oxidation is water, so if you make a waterless solution (e.g. Propanediol 90% + 10% AA) you won’t have as much oxidation as in water.
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BUT! I should mention that the study you provided is poorly designed. Only 12 females (almost like Garnier’s 9 out of 10 women on the jar), not statistically significant. Also, the study is blinded for the participants, but not double-blinded, the conductors know which area is treated with which product (or placebo). So I would not trust it.
Unfortunately, there are not reliable (with proper design: double- or triple-blinded, correct placebo, done on statistically relevant set of humans - different ages, genders, races, correct number of participants) studies of AA out there.
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Silicones and HEC
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Can you change the order and pour water phase into oil phase instead? Then you don’t have to scrape xanthan gum.
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Too many spam messages lately. Looks like some filtering mechanism is required, like do not let new users post the first message/topic before it is reviewed.
Or some AI that analyzes spam ????
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Depends on the ratio between water\pentylene glycol\oil. In commercial products I see they usually use polysorbate 20 for this in toners.
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Is any demo available for humble DIYers? I am not a chemist, but I like DIY skincare. I am also a software developer, so this project seems interesting to try from my professional perspective too!
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I see regularly Diethylphtalate in “parfumer’s alcohol” or “diffuser liquid” mixtures.
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Not sure about actual production, but in DIY you set it off with open lid for a night to cool down and gain final viscosity
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To me gel-like feeling give polymers, like Lecigel, Sepimax Zen, Aristoflex AVC etc.
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Is it really possible to make a gel without water? My assumption is your mixture just attracts water from the air and that’s why it is so slow.
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They claimed that ascorbic acid can dissolve in propylene glycol at up to 17% (uh, citation needed…).
It’s true, I’ve seen some patent stating that. The solubility in propylene glycol can increase in presence of Urea.
how on earth are you all (and the brains behind the patented C/E/F formula) managing to dissolve 20% ascorbic acid in a serum that has less than 50% water
Are we? Skinceuticals sell 15% formula. Lotioncrafter states 15%. It’s only you who tweaked the formula to get 20% ????
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Try to check powdered face washes. They often use clays and starches
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Preservation also depends on preservative content (how much it in?). pH. chelators. manufacturing condition (if contamination load is heavy in the facility - no preservative will handle this)
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You are at a wrong place to ask this question. It is formulation forum, not marketing/economics forum.
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Why not just try? I mean salt and glycerin are very cheap, you can prepare several small batches and see what ratio is the best for you.
Anyway, I found an SDS (safety datasheet) for KMS HAIRPLAY SEA SALT SPRAY product. It’s INCI is:
Water / Aqua / Eau, Magnesium Sulfate, Alcohol Denat., Propylene Glycol, Vitis Vinifera (Grape) Seed Oil, Mentha Piperita (Peppermint) Leaf Extract, Isoceteth-20, Citric Acid, PVP, Sea Salt / Maris Sal / Sel Marin, Sorbitol, Sodium Benzoate, Diazolidinyl Urea, Fragrance / Parfum.
In the SDS they say:
- ethanol content is 2.5 - 10%
- propylene glycol is 0.1 - 2%
Maybe this can be your starting point for Glycerin too: 0.1 - 2.0%
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Carbomer and many other DIY popular polymers (like Sepiplus, Lecigel, Aristoflex etc) will lose thickening ability in presence of strong electrolytes like sodium salts. That’s why suppliers always have a graph of polymer viscosity based on level of NaCl (table salt).
The solutions are:
- To use more electrolyte-tolerant polymer, e.g. Sepimax Zen. Not sure if it can handle 3% of SAP, but they suggest to add salts after thickening
- Use gums. Remove carbomer and increase xanthan gum (you already use it). Or you can use some mixture of gums, like Solagum
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It is not a shampoo, it is soap. And ads of your company.
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This is false. This rumor comes from the name oil-in-water (and some people think that oil-in-water == oil-to-water). In reality the emulsion you get depends on emulsifier you use.
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As I see on this forum, the mix is usually used because only one agent rarely covers all kind of spoilage (bacteria, mold or yeast).
For example in this thread: https://chemistscorner.com/cosmeticsciencetalk/discussion/euxyl-pe-9010-use-in-water-based-products/
mentioned that Euxyl PE9010 alone has a gap in antifungal efficacy for relevantly susceptible products.
chemistscorner.com
Euxyl PE 9010 use in water based products - Chemists Corner
Hello everyone,This is my first post here so please bear with me :# I've been researching the presevative Euxyl PE 9010 (INCI: Phenoxyethanol, ethylhexylglycerin) and…
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Zinc Oxide is not soluble in water
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I don’t think adding urea (another super finicky ingredient) is the solution I’m looking for
It’s not a suggested solution, just a remark from the same patent where solubility in PG is mentioned. The whole patent was about increasing solubility in PG using Urea.
If you want to have a source about PG solubility, here is the patent: https://patents.google.com/patent/US20070077261A1/en
It says:
It was also determined that in a composition comprising, by weight, 17% ascorbic acid and 83% propylene glycol prepared by heating the mixture at 75.degree. C., the ascorbic acid was soluble under this experimental condition. This result is consistent with the solubility data disclosed in U.S. Pat. No. 6,361,783.
patents.google.com
A method for dissolving ascorbic acid in a nonaqueous alcohol solvent using a solubilization enhancer is described. The amount of ascorbic acid solubilized in the nonaqueous alcohol solvent containing the solubilization enhancer is greater than the amount of ascorbic acid … Continue reading
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We don’t know their formula, mostly sure they just use enough water.
We know only formulas from Lotioncrafter and L’Oreal’s patent for CEF serum. And they don’t go over 15%.
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Maybe not glycerin but other humectant, like propylene glycol?
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It also depends on how much salt you add. Maybe you add too much and it flakes.