The Ordinary Guide
to Vitamin C.
Topical Vitamin C offers a wide array of benefits to the skin. However,
many forms of Vitamin C and many more formulations of Vitamin C are
available commercially with a potential to confuse the audience.
The guide offers guidance on the formulations of Vitamin C offered under The Ordinary range. It also offers education on Vitamin C itself and on the differences between formulations of Vitamin C at large.
The Ordinary's portfolio of Vitamin C formulations is listed below.
Tap product name to view product details.
|Vitamin C Suspension 23% + HA Spheres 2%||Heavy Serum||Suspension||Very High||High||10-20 secs.|
(Water-free suspension, tube format) This format is a suspension
of very fine L-Ascorbic Acid powder and, as such, provides the
most direct exposure of extremely high concentrations of Vitamin
C topically. With such format, there are 2 important things to
consider: 1) A very strong tingling but non-irritating sensation
is expected during the first 1-2 weeks of use until the skin's
tolerance to such high exposure is elevated; 2) The powder
exposure to the skin disallows the formula to feel like a serum,
lotion or cream and each application requires a few seconds to
feel absorbed by the skin. If desired, this formula can be
diluted in a cream base per application to allow the skin to
build tolerance over time. This formula feels gritty on the skin
for a few seconds. If this feeling is not desirable, we would
Vitamin C Suspension 30% in Silicone.
|Vitamin C Suspension 30% in Silicone||Heavy Serum with Smooth Finish||Suspension||Very High||High||10-20 secs.|
Much like our
Vitamin C Suspension 23% + HA Spheres 2%
formula, this product also offers a suspension but in light
silicones for a smooth, non-gritty skin finish. Despite the very
light forms of silicones used, silicones do impair dermal
exposure to Vitamin C slightly but the additional (30%)
concentration of Vitamin C helps compensate for this slight
inefficiency. A very strong tingling but non-irritating
sensation is expected during the first 1-2 weeks of use until
the skin's tolerance to such high exposure is elevated. If
desired, this formula can be diluted in a cream base per
application to allow the skin to build tolerance over time.
|100% L-Ascorbic Acid Powder||Light Powder||Powder||Very High||High||10-20 secs|
(Fine 325 Mesh Topical Powder) The 100% L-Ascorbic Acid Powder
visibly targets the appearance of uneven skin tone, dullness,
and signs of aging and is formulated to be mixed with other
treatments (except those containing Niacinamide or EUK 134). The
format of this formula is a very fine, anhydrous, L-Ascorbic
Acid powder and, as such, provides the most direct exposure of
extremely high concentrations of Vitamin C topically. With such
format, a very strong tingling but non-irritating sensation is
expected during the first 1-2 weeks of use until the skin's
tolerance to such high exposure is elevated. To ensure freshness
and to prevent any oxidation, it is preferable to immediately
use after mixing especially when mixed with water-based
products. For maximum benefit from peptides and LAA
individually, please alternate use between the two and avoid
mixing the LAA powder with peptide-based products. The quantity
of powder can be adjusted based on tolerance. We recommend using
between a quarter to half a scoop mixed in with 5-10 drops of
serum or a pea-dime size of emulsion based products.
|Ascorbic Acid 8% + Alpha Arbutin 2%||Light Oil||Anyhydrous Solution||Moderate||Moderate||10-20 secs.|
(Anhydrous serum, dropper format) The Ascorbic Acid 8% + Alpha
Arbutin 2% formula combines two of the most powerful brightening
agents in skincare: pure Vitamin C and Alpha Arbutin, both
solubilized in a completely water-free formula for ideal
stability. Vitamin C is an effective antioxidant that brightens
the skin tone and reduces signs of aging. Alpha Arbutin is a
highly-purified biosynthetic active ingredient that reduces the
look of dark spots and uneven skin tone. Vitamin C and Alpha
Arbutin are less stable in formulations that contain water and
use of them combined in formulations containing water is highly
discouraged. That is why this formulation is a water-free,
stable solution to avoid any contraindications. This product may
feel slightly "oily" for a few seconds after application,
despite the fact that it is completely free of oil.
|Ascorbyl Glucoside Solution 12%||Light Serum||Solution||High||Low||1-5 secs.|
(Water-based serum, dropper format) Ascorbyl Glucoside is a
water-soluble derivative of Vitamin C. It is much more stable in
water but it is less potent than direct L-Ascorbic Acid. Being
more compatible with water allows for a very pleasant serum
texture. It is considered a gold standard of Vitamin C
derivatives due to its high stability and comfortable use, but
it's impossible to achieve extremely high L-Ascorbic Acid
potency with this solution. Aside from the general benefits of
pure Vitamin C, Ascorbyl Glucoside has been shown to offer
specific skin brightening benefits.
|Magnesium Ascorbyl Phosphate 10%||Light Cream||Emulsion||Moderate||Very Low||5-10 secs.|
(Water-based cream, tube format) Magnesium Ascorbyl Phosphate
(MAP) is a water-soluble derivative of Vitamin C. It is more
stable in water but it is less potent than direct L-Ascorbic
Acid. It is compatible with water but higher concentrations
cannot be offered in a low-viscosity serum format and often
require emulsification to form a lotion or a cream. This formula
is a light cream that offers 10% pure MAP (very high solubilized
concentration). Aside from the general benefits of pure Vitamin
C, MAP has been shown to offer specific skin brightening
benefits, more so than other derivatives of Vitamin C. (Note:
some brands offer "powder" formulations that offer up to 15%
MAP. Such powders would offer less direct availability of MAP as
compared to an emulsion such as this formula which has
solubilized the complete 10% concentration of MAP. It is
extremely difficult to solubilize higher concentrations of MAP
in non-powder formulations.)
|Ascorbyl Tetraisopalmitate Solution 20% in Vitamin F||Light Oil||Solution||High||Very Low||1-5 secs.|
(Water-free, silicone-free serum, dropper format) Ascorbyl
Tetraisopalmitate is an oil-soluble derivative of Vitamin C that
can be used in higher concentrations without drawbacks. It is
one of the most stable derivatives of Vitamin C but, being a
derivative, its potency will not be directly comparable to pure
L-Ascorbic Acid. It is provided in this oil-format formula in
combination with Vitamin F, also known as essential fatty acids.
Aside from the general benefits of pure Vitamin C, Ascorbyl
Tetraisopalmiate has been shown to offer specific skin
|Ethylated Ascorbic Acid 15% Solution||Light Oil||Anyhydrous Solution||High||Very Low||10-20 secs.|
(Anhydrous serum, dropper format) The Ethylated Ascorbic Acid
15% Solution is an exceptionally-stable solution Ethylated
Ascorbic Acid. This water-free formula offers a direct-acting
approach to achieving a radiant, healthy-looking skin tone.
Unlike other Vitamin C derivatives, this ethylated form acts
directly like Vitamin C, is closer in molecular weight to actual
Vitamin C which allows for faster visible results, and offers a
much better stability profile than any known direct-acting form
of Vitamin C. Since this formulation is a water-free solution,
it may feel slightly "oily" for a few seconds after application,
despite the absence of all oils.
* Note: Our brands NIOD and
respectively, which are solutions of Ethylated Ascorbic Acid (EAA). EAA
offers as high a potency as direct L-Ascorbic Acid with minimal stinging
and extremely high stability even in a solution format. The cost of EAA,
however, is nearly 30 times the cost of pure L-Ascorbic Acid.
Patch testing prior to use is advised. Refer to our in-depth guide to patch testing.
General Vitamin C Guidance
The best property of any powerful antioxidant is also its worst property—it oxidizes. Basically, antioxidants bind to free “radicals” of oxygen so that your cell's don’t. The problem is that they may bind to oxygen in the bottle before you even buy any product claiming to contain antioxidants. And since Vitamin C has a very strong ability to bind to free radicals of oxygen, as soon as it’s dissolved in water, it starts to oxidize and change the colour of the solution (from clear to slight orange and later to dark orange). When this change happens, two things occur: 1) the activity of Vitamin C becomes disabled and 2) far worse, the “antioxidant” formulation actually turns into a “pro-oxidant” formulation. Many clinical skincare brands have filed patents that claims to stabilize Vitamin C in water and many have fought amongst themselves on whether or not they have breached each other’s patents. These patents and fights are simply meaningless because these respective formulations continue to show oxidation and change colour, while consumers believe that since there is a patent, this colour change might be OK. A patent grant does not verify that the function described actually works—a patent is not a validation of a discovery; it is simply an exclusivity to a position claim. Very simply, if a Vitamin C formula turns colour, the Vitamin C is oxidized and the formula becomes potentially damaging to the skin.
Other products have gotten around the stability issue of Vitamin C by using stabilized forms of the substance. These forms take on names such as Ascorbyl Glucoside (usually used at 2%), Magnesium Ascorbyl Phosphate (MAP, usually used at under 10%), Sodium Ascorbyl Phosphate (similar to MAP) and Ascorbyl Palmitate (very controversial and usually used at less than 0.2%). There are two issues to consider with this approach: 1) These forms still need to be converted to L-Ascorbic Acid—the pure form of Vitamin C useful to the skin and so a direct potency comparison to pure L-Ascorbic Acid should not be made—and 2) the maximum amounts of these materials that can be solubilized in a formula is between 0.5% and 10% depending on the material. The Ordinary offers the most studied forms of Vitamin C derivatives (Ascorbyl Glucoside, Magnesium Ascorbyl Phosphate and Ascorbyl Tetraisopalmitate) in independent formulations. It's notable that, leaving aside the general benefits of topical Vitamin C (where pure L-Ascorbic Acid wins), the derivatives of Vitamin C have been shown to offer better brightening results than pure L-Ascorbic Acid.
A few brands offer suspensions of Vitamin C in water-free formulations. These formulations do keep the Vitamin C stable but they are almost always offered in heavier silicone bases that interfere with efficient exposure of the entire Vitamin C content to the skin. The Ordinary offers both silicone-free suspensions of pure L-Ascorbic Acid and a smooth-finish suspension in very light silicones to minimize any impairment to dermal exposure.