We talk about vitamin C a lot at Lucere. It comes up in consultations, in our treatment rooms, and honestly, in a lot of casual conversations between our team and clients who want to know: what should I actually be using?
The answer always depends on your skin. But the brands we keep coming back to are SkinCeuticals and Functionalab. Both are professional-grade, clinically formulated, and results-driven in a way that most over-the-counter vitamin C serums simply aren’t. And within each brand, there are a few distinct products that serve different skin types and concerns really well.
Here’s our breakdown of what we carry, what makes each product worth the investment, and how to figure out which one belongs in your routine.
Why Professional-Grade Vitamin C Serums Are Different
Before we get into specific products, it’s worth explaining why it matters where your vitamin C comes from.
The vitamin C market is flooded. Walk into any drugstore or scroll through any beauty retailer, and you’ll find dozens of options at wildly different price points. The problem is that formulation quality varies enormously. The concentration of active ingredients, the pH of the formula, the stability of the vitamin C, and the presence of supporting ingredients all have a huge impact on whether a product actually delivers results or just sits on your skin looking pretty.
Professional-grade vitamin C serums, like the ones we carry at Lucere, are developed with clinical research behind them. They use pharmaceutical-quality ingredients. They’re formulated to actually penetrate the skin at a level that makes a difference. And they’re backed by data, not just marketing.
That’s the baseline we work from when making recommendations to our clients.
SkinCeuticals: The Clinical Gold Standard
SkinCeuticals is one of the most researched skincare brands in the world. Their antioxidant formulas are built on patented technology and decades of clinical study. If you’ve ever heard a dermatologist mention vitamin C serums, there’s a good chance SkinCeuticals came up. At Lucere, we carry three of their vitamin C serums. Each one is designed for a different skin profile.
C E Ferulic — For Normal, Dry, and Mature Skin
This is the one that started it all. C E Ferulic is widely considered the benchmark vitamin C serum. After years of recommending it, we understand exactly why.
The formula combines 15% pure L-ascorbic acid, 1% vitamin E, and 0.5% ferulic acid into a synergistic blend that does more than any single antioxidant could do alone. Ferulic acid enhances the stability and effectiveness of vitamins C and E, which is significant because L-ascorbic acid on its own is notoriously prone to oxidation. The ferulic acid essentially locks the formula in and makes it more potent.
C E Ferulic is clinically proven to reduce combined oxidative damage from free radicals generated by UV, ozone, and diesel exhaust by up to 41%. That’s not a soft claim. That’s a measurable result.
Beyond protection, this serum is a legitimate anti-aging tool. Regular use helps improve the appearance of fine lines and loss of firmness, and it delivers visible brightening over time. It’s particularly well-suited to normal, dry, and mature skin types because it has a slightly richer, more hydrating feel compared to the other SkinCeuticals vitamin C options.
One thing to know: L-ascorbic acid can turn yellow over time. Some clients interpret that as the product going bad. SkinCeuticals confirms that oxidation is minimal, and the formula remains effective for up to 36 months and up to 6 months after opening. So, some discolouration is normal and not a reason to toss the bottle.
Best for: Normal, dry, or mature skin. Anti-aging is a primary concern. Anyone who wants the most clinically established vitamin C formula available.
Phloretin CF — For Combination, Oily, or Pigmentation-Prone Skin
Phloretin CF takes a different approach. Instead of leading with high-dose L-ascorbic acid, this formula combines 10% vitamin C, 2% phloretin (derived from apples and fruit tree root bark), and 0.5% ferulic acid. The result is a lighter, more fluid texture that absorbs beautifully on oilier and combination skin types.
Phloretin is the standout here. This antioxidant neutralizes damaging free radicals, helps improve cell turnover, and improves the appearance of discoloration. If uneven skin tone, dark spots, or post-inflammatory hyperpigmentation are your main concerns, Phloretin CF is worth a serious look.
The formula is also fragrance-free, paraben-free, and dye-free, which makes it a good option for clients who are generally reactive to skincare products but still want the benefits of a medical-grade antioxidant serum.
Once absorbed, this vitamin C serum can remain effective for up to 72 hours — a notable detail for anyone who wonders how long their morning serum is actually working.
Best for: Combination or oily skin. Clients dealing with discoloration, sun damage, or uneven skin tone. A lighter feel than C E Ferulic.
Silymarin CF — For Oily, Acne-Prone, or Blemish-Prone Skin
Silymarin CF is SkinCeuticals’ answer for skin types that have historically struggled with vitamin C serums. Oily skin and blemish-prone skin tend to react poorly to formulas that are too heavy or too hydrating, and a lot of traditional vitamin C serums fall into that category.
Silymarin CF contains 15% L-ascorbic acid, 0.5% silymarin (a natural antioxidant from milk thistle), and 0.5% ferulic acid, plus 0.5% salicylic acid. The silymarin helps control oil oxidation, which is a key driver of breakouts and congestion. The salicylic acid keeps pores clear. Together, they create a formula that delivers full antioxidant protection without the heaviness that typically doesn’t work for oilier skin.
The texture is lighter and drier on the skin, which oily skin types often prefer. It also improves overall skin clarity and texture over time, making it a smart choice for clients who want both blemish control and anti-aging benefits in their morning routine.
Best for: Oily, acne-prone, or blemish-prone skin. Clients who want the full 15% L-ascorbic acid dose in a formula that won’t contribute to congestion or breakouts.
Functionalab: Next-Generation Stability and Innovation
Functionalab is a Canadian professional skincare brand built around the idea that the most effective formulas are also the most rigorously formulated ones. Their vitamin C products take a different approach than SkinCeuticals, prioritizing stability and multi-pathway benefits.
Ellagic C+ Serum — For Brightening, Firming, and Sensitive Skin
If you’ve ever bought a vitamin C serum, watched it turn orange within weeks, and wondered if you were doing something wrong, Ellagic C+ was essentially designed to solve that problem.
Functionalab’s experts selected ET-VC, a derivative of pure vitamin C, for its exceptional stability to light and heat, ensuring maximum efficacy without the risk of oxidation. This is a significant departure from L-ascorbic acid, which requires careful storage and degrades relatively quickly once opened.
But the stability story is only part of what makes this product interesting. ET-VC is described as the only form of vitamin C that helps boost both hyaluronic acid and collagen production, making it particularly relevant for clients focused on firmness and hydration alongside brightening.
The formula combines 20% vitamin C in this stable ethylated form with vitamin E and 2% ellagic acid and is reported to provide four times more protection against photodamage than vitamin C alone. Ellagic acid, derived from plant sources, contributes ongoing antioxidant activity and supports a more even, radiant complexion over time.
For clients who have found traditional L-ascorbic acid serums irritating or who have had trouble keeping vitamin C products from oxidizing before they’re finished, Ellagic C+ is a compelling alternative. The formula retains its colour and scent after opening, which is a good indicator of the stability built into the formulation.
Best for: Clients wanting a stable, high-concentration vitamin C that’s gentler on skin. Anyone dealing with dullness, fine lines, and early firmness loss. Sensitive skin types who have reacted to traditional L-ascorbic acid formulas.
SkinCeuticals vs. Functionalab: Which One Is Right for You?
The honest answer is that there’s no single “best” vitamin C serum. There’s just the right one for your skin.
SkinCeuticals excels in clinical breadth. The three serums cover a wide range of skin types, and the research behind them, particularly C E Ferulic, is among the most robust in the professional skincare world. If you’re working with a well-established skin type and want a formula with a long track record, SkinCeuticals is a safe and exceptional choice.
Functionalab brings something different to the table: stability and innovation. If you’ve had a frustrating experience with oxidizing serums, if you’re sensitive to L-ascorbic acid, or if you want a vitamin C that actively supports hyaluronic acid production alongside collagen, Ellagic C+ deserves a close look.
In some cases, clients use products from both brands as part of a layered skincare routine. A complimentary skincare consultation with our team is the most effective way to figure out what combination makes sense for you specifically.
A Note on Getting the Most From Your Vitamin C Serum
Whichever product you choose, a few basics stay the same. Apply your vitamin C in the morning, after cleansing, before moisturizer and SPF. Store it properly, away from heat and direct light. And give it time — consistent use over 6 to 8 weeks is typically when you’ll start seeing meaningful results in brightness and tone.
If you’re managing a specific concern like melasma, persistent hyperpigmentation, or significant photodamage, a topical serum is a valuable part of your routine, but it may not be the whole picture. Treatments like IPL Photofacial, PicoSure, or Fraxel can address pigmentation at a level that no topical product reaches on its own. Our Board-Certified Dermatologist and skincare educators can help you figure out whether your serum is doing enough, or whether a combined approach would get you further.
Frequently Asked Questions
Are these vitamin C serums available to purchase at Lucere without a consultation?
Yes. Both SkinCeuticals and Functionalab products are available at our Edmonton locations. That said, if you’re unsure which product is right for your skin, our skincare educators are happy to walk you through the options.
Can I use vitamin C if I have sensitive skin?
Yes, with the right formula. Functionalab Ellagic C+ is often a better starting point for sensitive skin than traditional L-ascorbic acid serums because of its gentler vitamin C derivative. The SkinCeuticals Serum 10 AOX+ is also formulated specifically for sensitive skin at a lower concentration.
How long does a bottle typically last?
With daily morning use, most vitamin C serums last approximately 30 to 60 days depending on how much you apply. Follow the directions on your specific product for the best guidance.
Can I use vitamin C alongside my other Lucere treatments?
In most cases, yes. Vitamin C serums are recommended post-laser by SkinCeuticals as part of a recovery and protection routine. Always follow your post-treatment care instructions, and check with our team if you’re unsure about what to use and when.
Find the Right Vitamin C Serum for Your Skin
The best skincare routine is one built around your skin, not someone else’s. At Lucere Dermatology & Laser Clinic, our team of experienced skincare educators and Board-Certified Dermatologist can help you choose the products that will make a difference for your specific concerns and skin type.
We carry SkinCeuticals and Functionalab at both of our Edmonton locations, and complimentary consultations are always available.