Find out why it's considered the holy grail of skincare ingredients.

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Vitamin C Serum
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Vitamin C serum is one of the most celebrated skincare products for a reason: it works. Along with sunscreen and retinol, any dermatologist will be quick to tell you that vitamin C is essential to every basic skincare routine - regardless of skin type.

So, what makes vitamin C so great? The antioxidant treats a number of common skincare concerns including dark spots, fine lines, wrinkles, and uneven skin texture. But while vitamin C is extremely effective, you'll only see results if you're using it correctly. And just like any other skincare ingredient, it comes with some dos and dont's.

Because knowledge is power, we turned to board-certified dermatologists Dr. Michelle Henry and Dr. Lily Talakoub to break down why vitamin C is so good for your skin, along with how to properly incorporate the ingredient into your routine.

How Does Vitamin C Benefit the Skin?

Vitamin C is a powerful antioxidant that neutralizes free radicals - which can lead to premature signs of aging, including wrinkles and fine lines. "The antioxidant activity of vitamin C protects against UV-induced damage caused by free radicals, which will prevent accelerated aging and skin cancer," Dr. Henry explains. "It also boosts firmness by regulating collagen production."

The antioxidant can also be used to treat dark spots and hyperpigmentation. Dr. Henry says that vitamin C can have lightening effects because it interferes with the enzymes used in melanin production.

How Should You Add Vitamin C to Your Routine?

First off, there are multiple forms of vitamin C. Ascorbate and ascorbic acid are naturally occurring forms of the antioxidants, while sodium ascorbyl phosphate is a synthetic, stable, water-soluble form of vitamin C that's produced to use in skincare products.

When shopping for a vitamin C skincare product keep the following in mind: L-ascorbic acid is the most beneficial and effective of all forms. However, if acne is also one of your skincare concerns, Dr. Henry says that there's some research that shows sodium ascorbyl phosphate can be effective at treating breakouts when used in one percent and five percent concentrations and incorporated into skincare routines that also include acne-fighting ingredients like benzoyl peroxide.

If you're looking for a vitamin C product that will deeply penetrate the skin, pick one with oil-soluble tetrahexyldecyl ascorbate, a derivative of L-ascorbic acid.

Generally, serums are the most common and popular vitamin C product category, but the ingredient is also found in moisturizers. Dr. Henry says that you can use vitamin C products twice a day, but recommends including one in your morning routine so that you can use retinol at night (more on that later).

Dr. Talakoub, on the other hand, likes mixing a few drops of a vitamin C serum into moisturizer for an antioxidant boost. "I like the serum versions, which are bound in oil because they are the most stable forms of vitamin C," she says.

VIDEO: When You Apply Sunscreen in Your Skincare Routine Actually Matters A Lot

What Are the Side Effects of Using Vitamin C?

Unless you have a specific allergy, vitamin C is an ingredient that's safe for all skin types to use. However, there are some ingredients you shouldn't mix with the antioxidant. Using vitamin C and retinol together can cause irritation and deactivate the ingredients, which makes them ineffective. The same goes for exfoliating AHA and BHA acids. However, you may see some vitamin C products that contain these ingredients at less potent levels.

"Retinoids, Retinols, and AHA and BHA acids should not be mixed with vitamin C as their efficacy may be reduced as they function optimally in environments of very different pH levels," says Dr. Henry. That's why she recommends using vitamin C in the morning, and reserving separate acids or retinol products for nighttime use.

One final note: While vitamin C is highly lauded, it's notorious for its bad smell. Both dermatologists say that the infamous "stale hot dog water" smell could be caused by the product's combination of ingredients or the vitamin C in it has gone bad. So make sure you check the expiration date before slathering that serum on your face.

The Best Vitamin C Serums

Skinceuticals Ferulic C E

Best Vitamin C Serums - Skinceuticals C E Ferulic
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Beloved by dermatologists, beauty editors, and skincare enthusiasts alike, this award-winning serum includes a mix of vitamin C and ferulic acid to protect skin from environmental stressors and prevent signs of aging including fine lines, wrinkles, and dark spots.

To shop: $166;

Tatcha Violet-C Brightening Serum 20% Vitamin C + 10% AHA

Best Vitamin C Serums - Tatcha Violet-C Brightening Serum 20% Vitamin C + 10% AHA
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In addition to skin-brightening vitamin C, 10% AHA fruit acids gently exfoliate for extra glowy results.

To shop: $88;

BeautyStat Universal C Skin Refiner

Best Vitamin C Serums
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This patented serum solves one of the biggest struggles associated with vitamin C: oxidization. Thanks to the encapsulated delivery system, the last drop is just as effective and potent as the first.

To shop: $80;

La Roche-Posay Pure Vitamin C Face Serum

Best Vitamin C Serums - La Roche-Posay Pure Vitamin C Face Serum with Salicylic Acid
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With the addition of salicylic acid, La Roche-Posay's vitamin C serum prevents future breakouts on top of fading old acne scars.

To shop: $40;

Drunk Elephant C-Firma Vitamin C Day Serum

Best Vitamin C Serums - C-Firma Vitamin C Day Serum
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Drunk Elephant's cult-favorite multitasking serum brightens, improves texture, minimizes fine lines and wrinkles, and firms skin. Just don't forget to apply sunscreen afterwards.

To shop: $80;

Hyper Skin Hyper Clear Brightening Clearing Vitamin C Serum

Best Vitamin C Serums
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Hyper's sole hero product specifically targets dark spots, hyperpigmentation, and acne scarring with its blend of vitamin C, E, and fruit enzymes.

To shop: $36;

L'Oréal Paris Revitalift Derm Intensives 10% Vitamin C Concentrate

Best Vitamin C Serums - L'Oreal Paris Revitalift Derm Intensives Vitamin C Facial Treatment
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This serum is proof that you don't have to spend a ton of money to get a efficacious vitamin C serum. With 10% pure vitamin C, the lightweight serum minimizes hyperpigmentation. You're also guaranteed to get continued results over time: the airtight tube and waterless formula ensures that the ingredient remains stabilized.

To shop: $20;

Best Vitamin C Serums
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Allies of Skin's serum features a whopping 35% L-ascorbic acid, along with 10% tetrahexyldecyl ascorbate and a blend of addition brightening and inflammation-reducing ingredients. The waterless base keeps the formula fresh, from top to bottom.

To shop: $118;