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Water-Based Lubricant - Formula Validation
Hi everyone!
I was hoping someone could validate my formula - mainly I want to know if the preservative system is okay
water - Qs
Hydroxyethylcellulose - 1.0%
Propanediol - 3%
Sodium Benzoate - 1.0
Potassium Sorbate - 0.5%any other ingredients that you think I should add?
It has to be clean at sephora!Thank you!
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19 Replies
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That question cannot be answered…without knowing the pH (as your system is pH dependent.)
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Cosmetic_Chemist said:Hi everyone!I was hoping someone could validate my formula - mainly I want to know if the preservative system is okay
water - Qs
Hydroxyethylcellulose - 1.0%
Propanediol - 3%
Sodium Benzoate - 1.0
Potassium Sorbate - 0.5%any other ingredients that you think I should add?
It has to be clean at sephora!Thank you!
Firs of all you are too high on both Sodium Benzoate and Postassium Sorbate. That should be more in the range 0.4% and 0.2%, respectively.
Second, your pH is going to have to be less than 6.0 and more preferrably around 4.5
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while agreeing with the above re content and pH the only real way is to send your product out for a preservative challenge test.
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@Cosmetic_Chemist Not sure that system would be enough to protect against all groups of microorganisms, with so much available water in your system, good amount of HEC and Propanediol (nutrients), lack of surfactants (they work in synergy with organic acids) and lack of boosters (like chelators). Not to mention the required low pH.
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Generally, no your preservation system is weak.
You should add a chelator, Sodium Benzoate and Potassium Sorbate both work by the same mechanism of action … use only one, not both and preferrably Sodium Benzoate. You’ll need to add an anti-bacterial and a pH adjuster.
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pH will be 4-5
pH will be adjusted with citric acid. I will also be adding Sodium Phytate as a cheleter/booster.
@MarkBroussard
Which antibacterial do you recommend instead of potassium sorbate? -
Do you have any restrictions on what you can use?
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It just needs to be clean at Sephora
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I’d be concerned to make sure it isnt going to cause yeast infections ( I assume it is for the down under area?)
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What is this used for?
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It is an adult novelty product and will be used down under.
Would this current formula likely cause a yeast infection?
If i use Phenoxyethanol and EDTA instead of current preservatives, would I get a better result?
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Your best bet would be Sodium Benzoate, Phenoxyethanol, EDTA … Yes, that would pass Clean at Sephora standards
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Is it for personal use or for selling?
I would suggest increase Propanediol to ≥10% for water activity, pH 4 and a blend of phenoxyethanol & parabens.
I am not sure about compatibility of phenoxyethanol with 1% HEC though. @PhilGeis may have better suggestions.That is the most gentle part of body and those preservatives are not so gentle.
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Parabens are not allowed under Sephora Clean requirements
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water - Qs
Hydroxyethylcellulose - 0.75%
Propanediol - 5%
Glycerin - 3%
Sodium Benzoate - 0.4%
Phenoxyethanol - 0.3%
EDTA - 0.1%
Aloe Vera Juice - 0.05%Would this be a better formula?
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I have made a nice lubricant with Natrosol 250 HHR (HEC) at 1.25%, propanediol, other humectants and Phenoxyethanol and Ethylhexylglycerin 90:10, respectively.
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Cosmetic_Chemist said:water - Qs
Hydroxyethylcellulose - 0.75%
Propanediol - 5%
Glycerin - 3%
Sodium Benzoate - 0.4%
Phenoxyethanol - 0.3%
EDTA - 0.1%
Aloe Vera Juice - 0.05%Would this be a better formula?
Looks ok - maybe phenoxy at 0.5% and Na benozate a bit less maybe 0.26%.
Will you challenge test through stability per ISO?
Do watch out for contaminated aloe juice. -
Cosmetic_Chemist said:water - Qs
Hydroxyethylcellulose - 0.75%
Propanediol - 5%
Glycerin - 3%
Sodium Benzoate - 0.4%
Phenoxyethanol - 0.3%
EDTA - 0.1%
Aloe Vera Juice - 0.05%Would this be a better formula?
I would replace Glycerin with Pentylene Glycol. Glycerin @ 3% is going to be a sticky mess and most women don’t like Glycerin in products for intimate areas. I would also eliminate the Aloe Vera Juice … It’s really not doing anything for your formula. Follow Phil’s recommendations on your preservative percentages.
This will probably fall under a 510K Medical Device. The required testing is expensive … on the order of $200K.
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Thank you so much! I am going to try out the new version and will report results once I hear back from the client!
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