Lactic Acid in Skincare: A Complete Guide

Lactic acid in skincare has become one of the most popular skincare ingredients in recent years. But what exactly is lactic acid, how does it work, and why is it so widely used? This complete guide related to the usage of lactic acid in skincare covers everything you need to know about this powerhouse skincare ingredient.

What is Lactic Acid?

Lactic acid is a type of alpha hydroxy acid (AHA) and it is found in the human body and some food stuff like yogurts, milk, and tomatoes. The lactic acid utilized in skincare is artificially created for inclusion in over-the-counter cosmetic products. Being an AHA, lactic acid acts as an exfoliant that separates the substance that keeps the skin cells together. This will make the dead cells fall off and the fresh skin under them will be revealed smoother and brighter. Together with glycolic acid, lactic acid is one of the best AHAs to enhance the texture and radiance of the skin.

Benefits of Lactic Acid to Skin

- Improves Texture and Radiance

- Exfoliates Dead Skin Cells.

- Reduces Fine Lines/Wrinkles Appearance

- Reduces Acne Breakouts

- Hydrates Skin

- Evens Skin Tone

- Promotes Collagen Production

Lactic acid delivers mild exfoliation without irritating sensitive skin because it has bigger molecules than other AHAs such as glycolic acid. It also acts as a humectant that draws and holds moisture in the skin. In general, lactic acid in skincare helps the skin appear, and feel smoother, softer and more radiant.

Using Lactic Acid in Your Skincare Routine

Lactic acid is an extremely flexible component which can be applied morning and/or night as part of your normal skincare regimen. Here are some tips for getting the most out of your lactic acid products: Here are some tips for getting the most out of your lactic acid products:

Start Slowly

When first using lactic acid, begin by applying it 1-2 times per week and gradually increase frequency based on your skin’s tolerance. Using too much too soon can irritate the skin.

Apply After Cleansing

Lactic acid exfoliates most effectively on clean skin, so apply your lactic acid product after cleansing and before applying other leave-on skincare products.

Use Lower Strengths

Look for lactic acid products that contain 5–15% lactic acid if you have sensitive skin. Those with more tolerant skin can use up to 20%.

Follow With Moisturizer

Because lactic acid can be slightly drying to the skin, always follow your lactic acid product with a gentle, hydrating moisturizer.

Avoid Irritated or Broken Skin

Do not apply lactic acid to areas of skin that are irritated or broken, as it can cause further irritation.

Wear SPF

Since lactic acid makes your skin more vulnerable to UV damage, wearing broad-spectrum SPF 30+ sunscreen every morning is a must when using lactic acid. Reapply as needed throughout the day.

What to Expect When Using Lactic Acid

Lactic acid in skincare is generally very gentle, especially when compared to more intense chemical exfoliants like glycolic acid. However, you should be aware of how your skin normally responds to new ingredients. Here’s what you can expect when adding lactic acid to your skincare routine:

- Temporary Tingling/Warm Sensation

- Mild to moderate flaking and peeling of skin

- A short skin “purging” process with some increased breakouts around 1-2 weeks in

Significant improvement in skin texture, tone, brightness, and clarity within 4-6 weeks

- Less visible signs of sun damage and aging over time

If at any point your skin reacts negatively to lactic acid with excessive stinging, itching, flaking, breakouts, or other bothersome side effects, stop using it immediately. These could be signs you need to switch to a lower concentration or that your skin can’t tolerate lactic acid well.

How Lactic Acid Compares to Other AHAs

Glycolic acid and lactic acid are the two AHAs used most widely in skincare. Glycolic acid offers faster exfoliation but can also cause more irritation than lactic acid. Here’s an overview of how lactic acid compares:

Glycolic Acid: derived from sugar cane, the smallest AHA molecule, penetrates the skin rapidly, results in faster cell turnover and exfoliation but often causes dryness and irritation

Lactic Acid: derived from milk, slightly larger molecule, provides gradual exfoliation, gently hydrates skin, suitable for sensitive skin types, less risk of irritation.

Mandelic acid: derived from bitter almonds, the largest AHA molecule, provides the gentlest exfoliation that is unlikely to irritate reactive skin, takes longer to show results

Citric acid: derived from citric fruits, mainly used for adjusting product pH rather than exfoliating

Lactic acid is typically considered gentler than glycolic acid but more effective for exfoliation than mandelic acid.

FAQs About Using Lactic Acid for Skin

Here we answer some of the most frequently asked questions about incorporating lactic acid in skincare routine:

Does lactic acid help with acne?

Yes! As a chemical exfoliant, lactic acid is able to penetrate pores and remove dead skin cells, excess oil, and other debris that cause acne. With consistent use, lactic acid helps prevent future breakouts too. Just be aware that increased breakouts can happen when first using lactic acid as part of the “purge” process.

Can I use lactic acid with retinol or benzoyl peroxide?

It’s best not to use harsh or drying acne medications like retinoids or benzoyl peroxide at the same time as lactic acid. Doing so could compromise your skin's moisture barrier and cause irritation. Instead, use them at separate times of day or alternate nights for the best results.

Does lactic acid help fade dark spots?

Over time, yes! By accelerating cell turnover and increasing collagen production, lactic acid helps even out skin tone and gradually fade dark spots and discoloration from past acne breakouts, melasma, sun damage, and scarring. Just be patient with seeing results.

When should lactic acid be applied?

Apply your lactic acid product after cleansing but before heavy creams or serums. Most dermatologists recommend using acids in your evening routine as sunlight can deactivate their effects. You can use gentler lactic acid formulas once daily in the morning too if your skin tolerates it well.

Can I use it if I have rosacea?

Lactic acid is likely safe for those with rosacea as long as they start very slowly with a low percentage formula. However, it’s still possible that lactic acid could trigger flushing, stinging, or bumps. Test cautiously and discontinue use if any negative reactions occur.

Conclusion

Thanks to its winning combination of effective exfoliation and skin-soothing hydration, it’s no wonder lactic acid in skincare has become such a key player in the skincare industry. When used properly, lactic acid can transform lackluster skin by accelerating cell turnover, reducing acne, smoothing fine lines and texture, fading dark spots, and creating an overall healthy, radiant complexion. Just introduce lactic acid slowly into your routine, do a patch test before applying it all over your face, and take care to hydrate and protect your skin when using this AHA.