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Can You Use Lactic Acid And Vitamin C Together? Let’s Break It Down!

Written BySimone de Vlaming Last Updated On
Lactic Acid And Vitamin C

If you’re a skincare lover, you’ve probably heard of lactic acid and vitamin C—two powerhouse ingredients known for their glow-boosting and skin-smoothing benefits. But can you use them together, or is it a recipe for irritation?

I don’t know if you have, but have you ever used two skincare products together and ended up with irritated skin instead of a glow-up? I know I did, but let me tell you, it’s not fun.

That might happen when you mix lactic acid and vitamin C incorrectly. But when done right, they can be a powerhouse duo for your skin. How does this work? Let me explain!

What Does Lactic Acid Do For Your Skin?

Lactic acid is like the gentle yet effective exfoliator in your skincare routine. As an alpha-hydroxy acid (AHA), it works on the surface of your skin to remove dead skin cells, revealing a smoother, brighter complexion.[1][2]

Bonus? It’s also a humectant, meaning it helps your skin hold onto moisture—perfect for those with dry or sensitive skin!

Key Benefits:

  • Exfoliates to improve texture and dullness
  • Hydrates while gently resurfacing
  • Helps fade dark spots and uneven skin tone

What About Vitamin C?

Think of vitamin C as your skin’s daily pick-me-up. This antioxidant brightens dull skin, evens discoloration, and protects against free radical damage (aka pollution and UV exposure). The result? A radiant, youthful glow![3][4]

Key Benefits:

  • Boosts collagen production for firmer skin
  • Brightens and evens out skin tone
  • Neutralizes environmental damage
Lactic Acid And Vitamin C

Can You Use Lactic Acid And Vitamin C Together?

Here’s where things get tricky. Both lactic acid and vitamin C are acidic, meaning they work at different pH levels. Using them at the same time can sometimes lead to irritation, redness, or reduce their effectiveness.

But does that mean you have to choose between them? Nope! You just need to use them strategically.

How Combining Lactic Acid And Vitamin C Works

So, what happens when these two powerhouse ingredients unite? The combination facilitates an enhanced exfoliation process. Lactic acid clears away dead cells, which allows vitamin C to penetrate deep into newly revealed layers of skin providing intense nourishment.

The Best Way to Combine Them:

  • Use lactic acid at night and vitamin C in the morning. This gives your skin time to absorb each ingredient without interference.
  • If you prefer to use both in the same routine, apply vitamin C first, wait 10–15 minutes, then follow with lactic acid. This allows each ingredient to work at its ideal pH.
  • Another option is alternating days—use vitamin C one day, lactic acid the next. This method reduces the risk of irritation while still getting the benefits of both.

Always finish with a good moisturizer and SPF (especially with vitamin C in the AM)!

What You Shouldn’t Do

To avoid any potential issues, never mix them or layer them! Instead, consider using these skincare ingredients at different times of the day. Incorporate vitamin C in your morning routine to benefit from its protective properties, and apply lactic acid at night to promote gentle exfoliation.

What To Avoid:

  • Layering both immediately without a waiting period
  • Using them together at the same time (especially if you have very sensitive skin)
  • Skipping sunscreen (vitamin C works best when protected from UV rays!)
  • Combining them with other strong actives like retinol or benzoyl peroxide without proper skin tolerance

Remember that all skin types react differently, so it’s important to introduce these products gradually into your routine. Start by applying once or twice weekly, then increase according to your tolerance level.

How To Incorporate Lactic Acid And Vitamin C Into Your Skincare Routine

Now, let’s put all the do’s and don’ts together into one skincare routine advice. Here are the most important facts to keep in mind:

  1. Starting Slow: If you are new to using lactic acid, begin with a low concentration to allow your skin to acclimate gradually. Consider using a lactic acid-based cleanser or toner.
  2. Alternating Usage: To prevent over-exfoliation, alternate the days you use lactic acid and vitamin C products. This allows your skin to reap the benefits of both ingredients without overwhelming it.
  3. Time of Application: Apply lactic acid products in the evening as part of your nighttime skincare routine. Vitamin C, on the other hand, is best applied in the morning to protect your skin throughout the day.
  4. Sun Protection: Always follow up with a broad-spectrum sunscreen when using vitamin C, as it can increase the skin’s photosensitivity. This step is crucial for maintaining the results achieved with these potent ingredients.

Who Should (or Shouldn’t) Use This Combo?

Best For:

  • Those with dull, uneven skin tone
  • People dealing with dark spots or post-acne marks
  • Skincare lovers looking for maximum glow ✨

Not Ideal For:

  • Super sensitive skin (might cause redness or irritation)
  • Beginners just starting out with acids
  • Those using strong prescription treatments (check with your derm first!)
Lactic Acid And Vitamin C

Final Verdict: Glow-Boosting Duo Or Skincare Disaster?

Lactic acid and vitamin C can be used together—but only if you apply them the right way. The key is to space them out and listen to your skin. If you’re new to acids, start slow and see how your skin reacts.

Have you tried this combo before? Let me know your experience in the comments! 💬👇

Frequently Asked Questions

Lactic acid is one type of Alpha Hydroxy Acid (AHA). AHAs are a group of chemical compounds known for their skin benefits. What sets lactic acid apart is that it’s derived from milk, and it’s a bit gentler on the skin than other AHAs, like glycolic acid.

Lactic acid works by gently exfoliating the outer layer of your skin, helping to get rid of dead cells and promoting a smoother, brighter complexion.

Other AHAs have slightly different properties and strengths, but lactic acid is a great option for people with sensitive or dry skin.

For optimal results, use lactic acid in the evening and vitamin C in the morning in your skincare routine.

When it comes to using skincare products during pregnancy or while breastfeeding, it’s essential to be cautious.

While both lactic acid and vitamin C are generally considered safe for topical use, everyone’s body is different, and some people may experience sensitivities during this time.

It’s a good idea to consult your healthcare provider or dermatologist before introducing new skincare products into your routine.

The timeframe for seeing results can vary from person to person, but with consistent use, you may start noticing some changes within around 4 to 8 weeks of regular use.

Beautymone takes every opportunity to use high-quality sources, including peer-reviewed studies, to support the facts within our articles. Read our editorial guidelines to learn more about how we keep our content accurate, reliable, and trustworthy.

[1] SHARQUIE, K.E., AL-TIKREETY, M.M. and AL-MASHHADANI, S.A. (2006), Lactic Acid Chemical Peels as a New Therapeutic Modality in Melasma in Comparison to Jessner’s Solution Chemical Peels. Dermatologic Surgery, 32: 1429-1436. https://doi.org/10.1111/j.1524-4725.2006.32352.x

[2] Sachdeva, S. (2010), Research Letter: Lactic acid peeling in superficial acne scarring in Indian skin. Journal of Cosmetic Dermatology, 9: 246-248. https://doi.org/10.1111/j.1473-2165.2010.00513.x

[3] Farris, P.K. (2005), Topical Vitamin C: A Useful Agent for Treating Photoaging and Other Dermatologic Conditions. Dermatologic Surgery, 31: 814-818. https://doi.org/10.1111/j.1524-4725.2005.31725

[4] Telang PS. Vitamin C in dermatology. Indian Dermatol Online J. 2013 Apr;4(2):143-6. doi: 10.4103/2229-5178.110593. PMID: 23741676; PMCID: PMC3673383. https://pmc.ncbi.nlm.nih.gov/articles/PMC3673383/

Simone de Vlaming is the founder of Beautymone and a beauty reviewer with over 10 years of industry experience. She personally tests products and shares honest, in-depth reviews. Her work has been featured on Glam, Bustle, Mic, The List, and more. Click here to learn more about Simone.

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