Peter Thomas Roth Instant FIRMx Glow-Filter Priming Serum Versus Rare Beauty Pore Diffusing Primer - Always an Optimist Collection
Updated on June 10, 2024
Overview
What they are
These products are both face primers. They have a total of 8 ingredients in common
Cool Features
They both contain exfoliants and hyaluronic acid
Suited For
They're both likely to be good for anti aging, dry skin, brightening skin, sensitive skin, reducing pores and scar healing
Free From
They both do not contain any harsh alcohols, common allergens, parabens or sulfates
What's Inside
They both contain silicones
We independently verify ingredients, and our claims are backed by peer-reviewed research. Spot a product that needs an update? Let us know.
Ingredient Info
Peter Thomas Roth Instant FIRMx Glow-Filter Priming Serum 54 ingredients
Rare Beauty Pore Diffusing Primer - Always an Optimist Collection 30 ingredients
About this product
About this product
At a glance
Click on any of the items below to learn more
Peter Thomas Roth Instant FIRMx Glow-Filter Priming Serum 54 ingredients
Rare Beauty Pore Diffusing Primer - Always an Optimist Collection 30 ingredients
Key Ingredients
Benefits
Concerns
Key Ingredients
Benefits
Concerns
Ingredients Side-by-side
Water
Skin ConditioningGlycerin
Humectant
Butylene Glycol
Humectant
Isononyl Isononanoate
EmollientCitrus Aurantium Bergamia Fruit Water
Skin ConditioningDimethicone
Emollient
Butyrospermum Parkii Butter
Skin Conditioning
Caprylic/Capric Triglyceride
MaskingGlyceryl Stearate
Emollient
Polyglyceryl-6 Distearate
Emulsifying
Cetearyl Alcohol
Emollient
Sorbitan Stearate
Emulsifying
Isostearyl Alcohol
Emollient
Mica
Cosmetic Colorant
Butylene Glycol Cocoate
Emulsifying
Bacillus/Soybean Ferment Extract
Skin ConditioningDiamond Powder
Abrasive
Niacinamide
Smoothing
Sodium Hyaluronate
Humectant
Sodium Hydroxide
BufferingCitric Acid
Buffering
Glutamic Acid
HumectantGlycine
Buffering
Histidine
HumectantIsoleucine
Skin ConditioningLeucine
Skin ConditioningLysine
Skin ConditioningPhenylalanine
MaskingAlanine
MaskingArginine
Masking
Proline
Skin ConditioningSerine
MaskingThreonine
Tyrosine
MaskingValine
MaskingSodium Phytate
Sodium Lactate
BufferingSilica
Abrasive
Ethylcellulose
Potassium Sorbate
Preservative
Sodium Benzoate
Masking
Hydroxyethylcellulose
Emulsion StabilisingAspartic Acid
MaskingDisodium Phosphate
BufferingPolysorbate 60
Emulsifying
Sodium Phosphate
BufferingPolysilicone-11
Titanium Dioxide
Cosmetic Colorant
Ethylhexylglycerin
Skin ConditioningDimethicone Crosspolymer
Emulsion StabilisingCarbomer
Emulsion StabilisingPolymethylsilsesquioxane
Iron Oxides
Phenoxyethanol
Preservative
Water, Glycerin, Butylene Glycol, Isononyl Isononanoate, Citrus Aurantium Bergamia Fruit Water, Dimethicone, Butyrospermum Parkii Butter, Caprylic/Capric Triglyceride, Glyceryl Stearate, Polyglyceryl-6 Distearate, Cetearyl Alcohol, Sorbitan Stearate, Isostearyl Alcohol, Mica, Butylene Glycol Cocoate, Bacillus/Soybean Ferment Extract, Diamond Powder, Niacinamide, Sodium Hyaluronate, Sodium Hydroxide, Citric Acid, Glutamic Acid, Glycine, Histidine, Isoleucine, Leucine, Lysine, Phenylalanine, Alanine, Arginine, Proline, Serine, Threonine, Tyrosine, Valine, Sodium Phytate, Sodium Lactate, Silica, Ethylcellulose, Potassium Sorbate, Sodium Benzoate, Hydroxyethylcellulose, Aspartic Acid, Disodium Phosphate, Polysorbate 60, Sodium Phosphate, Polysilicone-11, Titanium Dioxide, Ethylhexylglycerin, Dimethicone Crosspolymer, Carbomer, Polymethylsilsesquioxane, Iron Oxides, Phenoxyethanol
Water
Skin ConditioningDimethicone
Emollient
Methyl Trimethicone
Skin Conditioning
Dipropylene Glycol
MaskingGlycerin
Humectant
Butylene Glycol
Humectant
Vinyl Dimethicone/Methicone Silsesquioxane Crosspolymer
Dimethicone/Vinyl Dimethicone Crosspolymer
Skin ConditioningCetyl PEG/PPG-10/1 Dimethicone
Emulsifying
Sodium Chloride
Masking
Dimethicone/PEG-10/15 Crosspolymer
Silica
Abrasive
Propanediol
SolventSodium Benzoate
Masking
Potassium Sorbate
Preservative
Tocopheryl Acetate
Antioxidant
Eclipta Prostrata Extract
Skin ConditioningGlyceryl Acrylate/Acrylic Acid Copolymer
HumectantParfum
Masking
Camellia Sinensis Leaf Extract
Antimicrobial
Sodium Citrate
BufferingMelia Azadirachta Leaf Extract
Skin ConditioningHyaluronic Acid
Humectant
Hydrolyzed Hyaluronic Acid
Humectant
Sodium Hyaluronate
Humectant
Gardenia Florida Fruit Extract
Skin ConditioningNelumbo Nucifera Flower Extract
Skin ConditioningNymphaea Odorata Root Extract
RefreshingMoringa Oleifera Seed Oil
Emollient
Tocopherol
Antioxidant
Water, Dimethicone, Methyl Trimethicone, Dipropylene Glycol, Glycerin, Butylene Glycol, Vinyl Dimethicone/Methicone Silsesquioxane Crosspolymer, Dimethicone/Vinyl Dimethicone Crosspolymer, Cetyl PEG/PPG-10/1 Dimethicone, Sodium Chloride, Dimethicone/PEG-10/15 Crosspolymer, Silica, Propanediol, Sodium Benzoate, Potassium Sorbate, Tocopheryl Acetate, Eclipta Prostrata Extract, Glyceryl Acrylate/Acrylic Acid Copolymer, Parfum, Camellia Sinensis Leaf Extract, Sodium Citrate, Melia Azadirachta Leaf Extract, Hyaluronic Acid, Hydrolyzed Hyaluronic Acid, Sodium Hyaluronate, Gardenia Florida Fruit Extract, Nelumbo Nucifera Flower Extract, Nymphaea Odorata Root Extract, Moringa Oleifera Seed Oil, Tocopherol
Ingredients Explained
These ingredients are found in both products.
Ingredients higher up in an ingredient list are typically present in a larger amount.
Water. It's the most common cosmetic ingredient of all. You'll usually see it at the top of ingredient lists, meaning that it makes up the largest part of the product.
So why is it so popular? Water most often acts as a solvent - this means that it helps dissolve other ingredients into the formulation.
You'll also recognize water as that liquid we all need to stay alive. If you see this, drink a glass of water. Stay hydrated!
Learn more about WaterGlycerin is already naturally found in your skin. It helps moisturize and protect your skin.
A study from 2016 found glycerin to be more effective as a humectant than AHAs and hyaluronic acid.
As a humectant, it helps the skin stay hydrated by pulling moisture to your skin. The low molecular weight of glycerin allows it to pull moisture into the deeper layers of your skin.
Hydrated skin improves your skin barrier; Your skin barrier helps protect against irritants and bacteria.
Glycerin has also been found to have antimicrobial and antiviral properties. Due to these properties, glycerin is often used in wound and burn treatments.
In cosmetics, glycerin is usually derived from plants such as soybean or palm. However, it can also be sourced from animals, such as tallow or animal fat.
This ingredient is organic, colorless, odorless, and non-toxic.
Glycerin is the name for this ingredient in American English. British English uses Glycerol/Glycerine.
Learn more about GlycerinButylene Glycol (or BG) is used within cosmetic products for a few different reasons:
- It is a solvent, meaning that it helps to dissolve other ingredients. This also enhances the absorption of the product into one's skin.
- It is a humectant, which means that it helps attract moisture into the skin.
- It helps improve product application.
- It has mild preservative properties.
Overall, Butylene Glycol is a safe and well-rounded ingredient that works well with other ingredients.
Dimethicone is a type of synthetic silicone created from natural materials such as quartz.
What it does:
Dimethicone comes in different viscosities:
Depending on the viscosity, dimethicone has different properties.
Ingredients lists don't always show which type is used, so we recommend reaching out to the brand if you have questions about the viscosity.
This ingredient is unlikely to cause irritation because it does not get absorbed into skin. However, people with silicone allergies should be careful about using this ingredient.
Note: Dimethicone may contribute to pilling. This is because it is not oil or water soluble, so pilling may occur when layered with products. When mixed with heavy oils in a formula, the outcome is also quite greasy.
Learn more about DimethiconeSodium Hyaluronate is hyaluronic acid's salt form. It is commonly derived from the sodium salt of hyaluronic acid.
Like hyaluronic acid, it is great at holding water and acts as a humectant. This makes it a great skin hydrating ingredient.
Sodium Hyaluronate is naturally occurring in our bodies and is mostly found in eye fluid and joints.
These are some other common types of Hyaluronic Acid:
Learn more about Sodium HyaluronateSilica is a mineral naturally found in our skin. It helps to thicken and smooth the texture of a product. It also acts as an agent for other ingredients by increasing the absorption of other ingredients into the skin.
Silica is often used for absorption and can help reduce shine when products are applied. Silica occurs in naturally in materials like clay and sandstone, and it can also be produced synthetically.
Silica is present naturally within the skin during collagen production and when reducing inflammation.
Learn more about SilicaPotassium Sorbate is a preservative used to prevent yeast and mold in products. It is commonly found in both cosmetic and food products.
This ingredient comes from potassium salt derived from sorbic acid. Sorbic acid is a natural antibiotic and effective against fungus.
Both potassium sorbate and sorbic acid can be found in baked goods, cheeses, dried meats, dried fruit, ice cream, pickles, wine, yogurt, and more.
You'll often find this ingredient used with other preservatives.
Learn more about Potassium SorbateSodium Benzoate is a preservative. It's used in both cosmetic and food products to inhibit the growth of mold and bacteria. It is typically produced synthetically.
Both the US FDA and EU Health Committee have approved the use of sodium benzoate. In the US, levels of 0.1% (of the total product) are allowed.
Sodium benzoate works as a preservative by inhibiting the growth of bacteria inside of cells. It prevents the cell from fermenting a type of sugar using an enzyme called phosphofructokinase.
It is the salt of benzoic acid. Foods containing sodium benzoate include soda, salad dressings, condiments, fruit juices, wines, and snack foods.
Studies for using ascorbic acid and sodium benzoate in cosmetics are lacking, especially in skincare routines with multiple steps.
We always recommend speaking with a professional, such as a dermatologist, if you have any concerns.
Learn more about Sodium BenzoateIngredient Ratings
Here's what our community thinks of the ingredients in these products.
When to use
Peter Thomas Roth Instant FIRMx Glow-Filter Priming Serum 54 ingredients
Rare Beauty Pore Diffusing Primer - Always an Optimist Collection 30 ingredients
Reviews
Here's what our community thinks
Peter Thomas Roth Instant FIRMx Glow-Filter Priming Serum 54 ingredients
Rare Beauty Pore Diffusing Primer - Always an Optimist Collection 30 ingredients
Didn't do anything
Didn't do anything on my combination skin, not for pore minimizing or longevity of my makeup. I find that it actually makes my makeup slides off faster on my nose during the day.
So I don’t hate it. It just doesn’t make any noticeable difference. Maybe my pores are just too large.
