The Ordinary Serums Guide: Which Serum to Buy for Your Skin

You should choose a The Ordinary serum based on your precise primary skin concern. If you want to fade dark spots or sun damage, select a vitamin C or alpha arbutin serum. For acne-prone or oily skin, start with niacinamide. If you are targeting fine lines and wrinkles on resilient skin, a retinol serum is your best bet. For general redness or compromised barrier, opt for hyaluronic acid or niacinamide. This guide will help you match over a dozen serums to your unique goals.

With its straightforward ingredient focus and transparent pricing, The Ordinary democratized actives in skincare. But the sheer number of nearly identical-looking bottles can be overwhelming. This is a guide for the person standing in front of the shelf or scrolling online, wondering, “Which one is actually for me?” We will not just list products, we will decode the active ingredients, show you what they target, and provide clear editorial picks based on skin type and environment. Let’s move past the hype and into the specifics.

How to Use This Guide: A Decision Framework

Before diving into specific serums, use this framework to narrow your choice. First, identify your primary goal. Is it clearing breakouts, fading marks left by breakouts, reducing fine lines, or intense hydration? Your first serum should directly address that goal. Second, assess your skin’s sensitivity. If your skin stings with most products or you have conditions like rosacea, start with the gentlest option in your chosen category (e.g., squalane over retinol). Third, consider formulation compatibility. Avoid combining multiple direct acids (like AHA/BHA with a strong vitamin C) or high-strength retinoids unless you know your skin can tolerate it. Start with one active, assess results over 6-8 weeks, then consider adding a second.

Best The Ordinary Serum for Hyperpigmentation

Hyperpigmentation, whether from sun damage (sun spots), acne (post-inflammatory hyperpigmentation, or PIH), or melasma, involves an overproduction of melanin in the skin. The most effective The Ordinary serums for this target the melanin production pathway at different stages.

Alpha Arbutin 2% + HA: This is often the smartest first choice. Alpha arbutin is a derivative of hydroquinone that inhibits tyrosinase, the key enzyme in melanin production, but is generally considered gentler and suitable for all skin tones¹. It’s a good entry point for fading newer marks without the irritation risk of stronger actives. Editorial pick for beginners: We recommend this over Vitamin C suspensions for those new to treating pigmentation, as it’s far less likely to cause tingling or pilling.

Ascorbic Acid (Vitamin C) Suspensions (23% + HA Spheres 2%, 30% in Silicone): These use pure L-ascorbic acid, the most researched form of vitamin C. It works by both inhibiting melanin production and acting as an antioxidant to prevent new darkening from UV exposure². Editorial judgment: The 23% and 30% formulas are notoriously gritty and can feel hot or tingly on application. They are powerful but best for experienced users with non-sensitive skin. The silicone-based 30% is slightly more tolerable but can feel heavy.

Azelaic Acid Suspension 10%: This multi-tasking ingredient is excellent for those whose hyperpigmentation is coupled with acne or rosacea. It has anti-inflammatory properties and helps normalize keratinocyte function, which can improve both red and brown post-acne marks. Price tier: $$.

Best The Ordinary Serum for Acne and Oil Control

Managing acne involves reducing inflammation, regulating sebum production, and keeping pores clear. The Ordinary offers several options that work on these fronts without overdrying the skin.

Niacinamide 10% + Zinc 1%: This is the cornerstone serum for oily and acne-prone skin. Niacinamide (Vitamin B3) at 10% helps regulate sebum production, minimizes pore appearance, and calms inflammation³. The added zinc offers further oil control and anti-bacterial benefits. Editorial judgment: For some, the 10% concentration can cause initial flushing or mild irritation. If you experience this, try applying it every other day or after moisturizer to buffer it. Price tier: $.

Salicylic Acid 2% Solution: This beta-hydroxy acid (BHA) is oil-soluble, allowing it to exfoliate inside the pore lining. It dissolves the mix of sebum and dead skin cells that can lead to clogs and blackheads. It’s a targeted treatment, best applied directly on breakouts or oily zones. Price tier: $.

The Ordinary vitamin C vs niacinamide is a common question. Can you use them together? The brand advises against combining direct acids like Ascorbic Acid with Niacinamide, as the low pH of vitamin C can potentially degrade niacinamide. However, many dermatologists note this reaction requires high heat and is unlikely to occur significantly on your face. A safer routine is to use vitamin C in the AM and niacinamide in the PM, or choose a vitamin C derivative (like Ethylated Ascorbic Acid) that is pH-neutral and compatible.

The Ordinary Retinol Review: Anti-Aging Options

Retinol, a vitamin A derivative, is the gold-standard, evidence-backed ingredient for increasing skin cell turnover, boosting collagen production, and reducing the appearance of wrinkles⁴. The Ordinary offers a range of retinoids at various strengths, making it an excellent entry point for beginners learning about retinol serums.

Granactive Retinoid 2% Emulsion: This is often the best starting point. It uses hydroxypinacolone retinoate (HPR), a next-generation retinoid ester that the brand claims offers retinoid-like results with less irritation. Formulation analysis from INCI Decoder confirms it is in a soothing, hydrating emulsion base. Editorial pick for beginners: We recommend this over the straight retinol formulas for anyone new to vitamin A, as it’s far more forgiving while still being effective.

Retinol 0.2%, 0.5%, 1% in Squalane: These are pure retinol serums suspended in squalane oil. Squalane is a biocompatible lipid that mimics skin’s own sebum, offering hydration. Start with the lowest concentration (0.2%) and use it only 1-2 nights per week, gradually increasing frequency before considering a higher strength. Editorial judgment: The squalane base is excellent for dry skin but can feel too rich for very oily types. If you’re oily, you might prefer the Granactive Retinoid emulsion.

Key considerations: All retinoids can cause dryness, peeling, and sun sensitivity. They are strictly for nighttime use, followed by sunscreen every morning without fail. Do not use them if you are pregnant or breastfeeding.

Best The Ordinary Serums for Hydration and Barrier Repair

Hydration and a strong skin barrier are the foundation of all skin health. These serums deliver moisture and help repair the lipid matrix that keeps water in and irritants out.

Hyaluronic Acid 2% + B5: This serum combines multiple molecular weights of hyaluronic acid to hydrate various layers of the skin, paired with panthenol (B5) to support barrier repair. Low molecular weight HA can penetrate the stratum corneum, while high molecular weight HA forms a film on the surface to pull moisture from the air⁵. Editorial judgment: In very dry climates, HA can pull moisture from your skin if the air lacks humidity, potentially leaving skin tighter. Apply to damp skin and seal with a moisturizer to prevent this.

“B” Oil: This is a blend of barrier-supporting oils and lipid-soluble nutrients like squalane, marula, and borage oil. It’s excellent for replenishing the skin’s natural lipid layer, reducing transepidermal water loss. Price tier: $$.

Niacinamide 10% + Zinc 1% also belongs in this category. Beyond oil control, niacinamide is clinically shown to improve skin barrier function by increasing the production of ceramides and free fatty acids in the stratum corneum³. This makes it a dual-action product for oily yet dehydrated or sensitized skin.

Direct Acids: AHA/BHA Exfoliating Serums

These are chemical exfoliants that dissolve the “glue” holding dead skin cells together. They improve texture, brightness, and can help with mild congestion. They are potent and should be introduced slowly.

Glycolic Acid 7% Toning Solution: A liquid exfoliant with glycolic acid, an alpha-hydroxy acid (AHA) that works on the skin’s surface. It’s best for improving dullness, rough texture, and mild sun damage. Use only 2-3 times per week at night.

Lactic Acid 5% + HA 2% / 10% + HA 2%: A gentler AHA alternative to glycolic acid due to its larger molecular size. Lactic acid is also a natural humectant. The 5% is ideal for sensitive skin or acid beginners; the 10% is for more resilient skin. Price tier: $.

Mandelic Acid 10% + HA: The gentlest AHA option from The Ordinary. Its large molecular size penetrates slowly, causing less irritation. It is also oil-soluble, making it a good choice for both exfoliation and mild acne. An excellent pick for those with darker skin tones prone to post-inflammatory hyperpigmentation from stronger acids.

The Ordinary for Beginners: A Simple Starter Routine

If you are new to The Ordinary or active skincare in general, start simple. The goal is to introduce one effective active without overwhelming your skin. A minimalist, results-oriented routine could look like this:

AM: Cleanse (or just rinse with water), Hyaluronic Acid 2% + B5 on damp skin, moisturizer, sunscreen (non-negotiable).

PM: Cleanse, active serum, moisturizer. For your first active serum, choose one based on your top concern:

• For texture/dullness: Lactic Acid 5% + HA (2-3 nights/week).
• For oil/acne: Niacinamide 10% + Zinc 1% (nightly).
• For first signs of aging: Granactive Retinoid 2% Emulsion (2-3 nights/week).
• For hydration focus: Hyaluronic Acid 2% + B5 (nightly).

Use this single active for 6-8 weeks to assess tolerance and results before considering adding a second, like a vitamin C serum in the morning. For a deeper dive on starting with this potent ingredient, see our guide to the best vitamin C serums.

Common Questions

Can I use The Ordinary Niacinamide and Vitamin C together?

The brand advises against combining their direct-acid Vitamin C (Ascorbic Acid) with Niacinamide due to potential pH conflict. A safer approach is to use vitamin C in the morning and niacinamide at night, or choose a stabilized vitamin C derivative like Ethylated Ascorbic Acid 15% Solution, which is formulated at a neutral pH and is compatible.

What’s the difference between Retinol and Granactive Retinoid?

Retinol is a classic, well-researched vitamin A derivative that converts to retinoic acid in the skin. Granactive Retinoid (Hydroxypinacolone Retinoate) is a newer ester that the brand claims binds directly to retinoid receptors with less conversion needed, potentially offering similar benefits with less irritation. For beginners, Granactive Retinoid is often the more tolerable starting point.

Which serum is best for fading acne scars?

For red or purple post-acne marks (post-inflammatory erythema), Azelaic Acid 10% or Niacinamide 10% + Zinc 1% are excellent for reducing inflammation. For brown marks (post-inflammatory hyperpigmentation), Alpha Arbutin 2% + HA or a Vitamin C serum like Ascorbyl Tetraisopalmitate Solution 20% in Vitamin F are targeted choices.

How long does it take to see results from The Ordinary serums?

This depends on the active and your concern. Hydration (HA) can be immediate. Brightening and texture improvement (AHAs, Vitamin C) often show in 4-6 weeks. Results from retinoids and significant hyperpigmentation fading typically require a minimum of 8-12 weeks of consistent use. Patience is key with actives.

Why does The Ordinary Vitamin C feel gritty?

The pure Ascorbic Acid powders (23% and 30%) are suspensions, meaning the vitamin C is not fully dissolved. The grit is the crystalline ascorbic acid. This is a trade-off for a high-potency, water-free formula that maximizes stability. The “in Silicone” version feels slightly smoother but still has texture.

Can I use two serums at the same time?

Yes, but with rules. Apply water-based serums first, from thinnest to thickest consistency. Avoid layering multiple potent actives (like a retinoid and a direct acid) unless your skin is very resilient. A common safe pairing is Hyaluronic Acid (hydration base) followed by a treatment serum like Niacinamide or Alpha Arbutin.

Do I need to use a moisturizer with The Ordinary serums?

Absolutely. Most serums are treatments, not moisturizers. They deliver active ingredients but often lack the emollients and occlusives needed to seal in hydration. Always follow your serum with a moisturizer suited to your skin type, especially when using actives like retinoids or acids that can compromise the barrier.

When a The Ordinary Serum Isn’t the Answer

While The Ordinary serums are effective for many common concerns, they are not substitutes for medical treatment. If you have severe, cystic acne that does not respond to over-the-counter salicylic acid or niacinamide, you may need prescription retinoids or antibiotics. Similarly, if you have melasma, a complex hormonal condition, OTC lighteners may provide limited improvement, and consulting a dermatologist for options like prescription hydroquinone is advised. For deep wrinkles, volume loss, or significant sun damage, professional treatments like laser, peels, or prescription tretinoin will be more impactful than any OTC serum. If your skin barrier is severely compromised, stinging with almost any product, the priority is to stop all actives and focus on a bland, reparative regimen until your skin heals.

Conclusion

Choosing the right The Ordinary serum is about matching a specific, high-concentration active ingredient to your primary skin goal. If you only buy one, make it the one that directly targets your biggest concern: Niacinamide 10% + Zinc 1% for oil and pores, Alpha Arbutin 2% + HA for dark spots, or Granactive Retinoid 2% for aging. For those new to actives, start with one formula, introduce it slowly, and always pair it with moisturizer and sunscreen. The strength of The Ordinary is its simplicity and transparency, allowing you to build a truly customized routine. To see current pricing and purchase options for our top picks, check their availability at major retailers.

References

1. Zhu, W., & Gao, J. (2008). The use of botanical extracts as topical skin-lightening agents for the improvement of skin pigmentation disorders. Journal of Investigative Dermatology Symposium Proceedings, 13(1), 20–24. https://doi.org/10.1038/jidsymp.2008.9
2. Telang, P. S. (2013). Vitamin C in dermatology. Indian Dermatology Online Journal, 4(2), 143–146. https://doi.org/10.4103/2229-5178.110593
3. Bissett, D. L., Miyamoto, K., Sun, P., Li, J., & Berge, C. A. (2004). Topical niacinamide reduces yellowing, wrinkling, red blotchiness, and hyperpigmented spots in aging facial skin. International Journal of Cosmetic Science, 26(5), 231–238. https://doi.org/10.1111/j.1467-2494.2004.00228.x
4. Mukherjee, S., Date, A., Patravale, V., Korting, H. C., Roeder, A., & Weindl, G. (2006). Retinoids in the treatment of skin aging: an overview of clinical efficacy and safety. Clinical Interventions in Aging, 1(4), 327–348. https://doi.org/10.2147/ciia.2006.1.4.327
5. Essendoubi, M., Gobinet, C., Reynaud, R., Angiboust, J. F., Manfait, M., & Piot, O. (2016). Human skin penetration of hyaluronic acid of different molecular weights as probed by Raman spectroscopy. Skin Research and Technology, 22(1), 55–62. https://doi.org/10.1111/srt.12228