Vivier built its name on vitamin C, which is why it sells several serums that look almost identical on the shelf. C E Peptides, Kine-C and Radiance Serum are the three that shoppers confuse most. They share the same core ingredient and the same bottle size, and they differ in what is added around the vitamin C. Here is the difference in plain terms, with current US prices.

C E Peptides vs Kine-C vs Radiance Serum: which should you choose?

How do the three compare side by side?

What do the three serums have in common?

Vitamin C in the form of L-ascorbic acid is one of the most studied antioxidants in skincare. Used in the morning under sunscreen, it helps defend skin against the visible effects of sun, pollution and smoke, and over time it supports a brighter, more even-looking tone and a smoother look to fine lines.

Vivier uses pharmaceutical-grade L-ascorbic acid USP across its vitamin C range, and it describes all of its vitamin C serums as oil-free, hypoallergenic, paraben-free and non-comedogenic. All three of these serums come in a 30 mL bottle, are applied the same way (2 to 3 drops over the face, neck, chest and backs of the hands) and sit in the same place in a routine: after cleansing and toning, before retinol, moisturizer and sunscreen.

So you are not choosing between a good serum and a weaker one. You are choosing which supporting ingredients match your skin.

Who should choose C E Peptides?

C E Peptides is the Vivier bestseller and the most rounded of the three. It combines 10% vitamin C with vitamin E and a blend of three proprietary peptides, and Vivier positions it to protect, correct, brighten and nourish. The brand describes skin as soft, glowing and hydrated, with a smoother look to fine lines.

Vitamin E matters here for two reasons. It is an oil-soluble antioxidant that complements water-soluble vitamin C, and it adds a conditioning feel that drier skin tends to appreciate. Vivier also lists C E Peptides as suitable for skin recovering after aesthetic procedures. Follow your provider on timing if that is you.

Choose it if: your skin is normal to dry, your goals are fine lines, dullness and overall glow, and you want one vitamin C serum that does the most. At $204 it is the highest priced of the three.

Who should choose Kine-C?

Kine-C carries the same 10% vitamin C as C E Peptides in an oil-free serum, with two proprietary peptides. Vivier describes it as targeting the signs of aging and environmental damage while optimizing hydration, and lists it for normal, combination and oily skin.

The practical difference from C E Peptides is feel and fit. Kine-C leaves out the vitamin E and uses a shorter ingredient list, which suits skin that already makes plenty of its own oil or that dislikes richer textures under sunscreen and makeup.

Choose it if: your skin is combination or oily, or you simply prefer a lighter finish, and your goal is fine lines and brightness. It is $190.

Who should choose Radiance Serum?

Radiance Serum is built for tone before anything else. It contains 8% vitamin C alongside arbutin and resorcinol, two brightening ingredients Vivier uses to address mild to moderate uneven skin tone and the look of dark spots, while the vitamin C works on fine lines and radiance.

The vitamin C percentage is slightly lower than the other two, which is not a weakness. The formula spends its budget on a second and third brightening ingredient instead, and that is the right trade if discoloration bothers you more than lines do.

Choose it if: your main concern is dark spots, sun spots or a blotchy, uneven look. It is the lowest priced of the three at $170. Daily sunscreen is essential with any brightening routine, because sun exposure brings visible discoloration back.

Where do Serum 10, Serum 30 and QuintiSerum fit?

Vivier makes more than three vitamin C serums, and the others answer different questions.

In short: Serum 10 is the entry point, C E Peptides and Kine-C are the everyday anti-aging choices split by skin type, Radiance Serum and Serum 30 are the tone specialists (mild to moderate versus stubborn), and QuintiSerum and GrenzCine Serum are the step-ups for advanced concerns. The full order is in The Best Vivier Serums, Ranked.

How do you decide in under a minute?

How do you use a Vivier vitamin C serum?

Cleanse and tone first. Place 2 to 3 drops in your palm and press a thin layer over the face, neck, chest and backs of the hands, once or twice daily. Follow with retinol or other targeted products at night, then moisturizer, then sunscreen in the morning. Vivier notes that L-ascorbic acid may cause a slight tingling in some people, which is normal and usually fades with time.

You only need one vitamin C serum at a time. Using two together does not double the benefit and makes it harder to tell what your skin likes. If you want both peptides and tone correction, use C E Peptides or Kine-C in the morning and add a brightening step such as Skin Brightening Cream at night. See How to Build a Vivier Routine for full morning and evening routines.

Where should you buy Vivier vitamin C?

Vivier is a professional skincare brand, sold through skincare clinics and authorized retailers. Its vitamin C serums are built on L-ascorbic acid, an ingredient that loses strength with age, heat and air, so a bottle from an unknown seller may be old, badly stored or not genuine, and it comes with no retailer guarantee.

SkinCrew is an Authorized Vivier US Retailer. Every product is sourced direct through official Vivier channels, batch-fresh, and backed by our 45-Day Satisfaction Guarantee, with free US shipping on orders of $99 or more. Shop the full range on the Vivier brand page.

More Vivier reading: The Best Vivier Serums, Ranked; Where to Buy Vivier Online; How to Build a Vivier Routine. For the wider brand story see the complete Vivier guide and the Vivier hero products rundown, and find more guides in The Skin Edit.

What else do people ask about Vivier vitamin C serums?

Related reading