Some Chemicals in Lemon Juice May Help
The Essential Info
Applying lemon juice topically to acne-prone areas of the skin is a popular at-home remedy. However, since scientists have not performed clinical trials to study the effect of lemon juice on acne, we must rely on studies that have investigated specific chemicals that are in lemon juice, like alpha hydroxy acids (AHA), and extrapolate from there.
This research suggests that certain chemicals in lemon juice, as well as chemicals in lemon peels, may have the potential to help modestly reduce acne symptoms through reducing:
- Bacteria growth
- Skin oil production
Warning: Leaving lemon juice on the skin for a prolonged period and going out in the sun while lemon juice is still on the skin can lead to severe burns. Stay indoors while treating your skin with lemon juice, and be sure to rinse it off after about 10 minutes.
The Bottom Line: While it is possible that applying lemon juice to the skin might help reduce acne to some degree, it is unlikely that lemon juice alone will clear acne. Keep your expectations realistic, and if you are aiming for dramatic improvement in your acne, consider proven treatments instead of, or in addition to, lemon juice.
- Skip Down to How to Use Lemons for Acne
- Chemical Composition of Lemons
- Potential Benefits of Lemons on Acne
- Side Effects of Applying Lemon Topically
Numerous online anecdotal reports suggest that lemon juice helps reduce acne, while others report no benefit.
Scientists have not performed any studies investigating the effect of lemon juice directly on people with acne. However, lemon juice as well as the oils in lemon peels contain certain chemicals that may help suppress the factors involved in acne.
Chemical Composition of Lemons
Lemons are composed of:
- A juice-filled pulp
- A fiber-rich white area called albedo
- A peel called flavedo
Lemon juice: Lemon juice is extracted from the pulp and consists of 60% water, 5 – 8% citric acid, and a mixture of other chemicals, including malic acid, ascorbic acid (vitamin C), glucose, and minerals like potassium and magnesium. Citric acid and malic acid are alpha-hydroxy acids (AHAs), which are commonly used in skincare products for the treatment of acne.1,2 This gives us a hint that lemon juice may in fact help reduce acne in a similar way to AHAs.
Lemon peel: Most people using lemons to treat acne only use lemon juice and discard the peel. However, the lemon peel contains a high concentration of a fatty acid called linoleic acid. Acne-prone skin tends to be deficient in linoleic acid. Whether the oils from a lemon peel can be topically applied and help increase linoleic acid levels, and in turn treat acne, is still unknown.1
Potential Benefits of Lemons on Acne
Several studies investigating the effect of lemon juice and lemon peels on acne have found that chemicals in lemons may help:
- Reduce the growth of acne bacteria
- Decrease skin oil production
- Reduce inflammation
All of these could theoretically help reduce acne. Let’s have a look one by one.
Reducing the growth of acne bacteria
Acne bacteria,called C. acnes, is a common bacteria that lives in the skin of people both with and without acne, but can worsen acne when it begins over-growing.
Three studies have found that lemon juice itself, or certain chemicals found in lemon juice, may possess antibacterial properties, which would potentially suppress C. acnes growth.
Expand to see details of these three studies
Decreasing skin oil production
Skin oil, called sebum, is a contributing factor to acne. Generally speaking, the more sebum a person has, the more likely he or she will develop acne.
One study has found that citrus peel components may decrease the production of sebum.
Expand to see details of study
Acne is at its root an inflammatory disease, so anything that can reduce inflammation could hypothetically reduce acne symptoms. Furthermore, when inflammation in acne lesions does not go away in a timely manner, it can lead to acne scarring.
Three studies have found that chemicals in lemons may decrease inflammation by inhibiting a variety of specific inflammatory proteins.
Expand to see details of these three studies
Side Effects of Applying Lemon Topically
Applying lemon to the skin can sometimes cause side effects. Certain substances in citrus fruits like lemon are phototoxic, which means that when exposed to the sun’s rays, they can react to produce harmful chemicals. These chemicals can produce a strong burning reaction in the skin known as phototoxic dermatitis.
One case report published in the journal Wounds in 2017 described a 7-year-old girl who squeezed a lemon, rubbed it on her skin, and then continued to play in the Arizona sun. Within 24 hours, the girl experienced severe burning and blistering, with multiple first- and second-degree burns on her skin. The cause of this injury was furocoumarin, a chemical found in lemon that had reacted under the sun’s rays.8
This case underscores the importance of avoiding sun exposure while lemon juice is on the skin and also rinsing the lemon juice off after about 10 minutes.
How to Use Lemons for Acne:
- Very gently wash your skin with only your bare hands, using a cleanser designed for sensitive facial skin.
- Rinse thoroughly with warm (not hot) water.
- Cut a lemon in half and squeeze out the juice into a bowl. Tip: Use a citrus juicer to get all the juice out.
- (Optional) Peel the lemon and cut the peel into small pieces. Put the small pieces of the lemon peel into a garlic press and squeeze out the oils and add it to the juice in the bowl.
- Soak up the juice (and oils if you added them) with a cotton ball or cotton pad.
- Very gently apply to your skin.
- Repeat steps 4 and 5 until you have covered any areas of your skin that have acne or are prone to acne.
- Allow the juice (and oils if you added them) to dry. This should take about 5-10 minutes. Note: If your skin stings too much or you experience too much discomfort, rinse it off immediately with warm water. Caution: Avoid sun exposure while the lemon juice is on your skin.
- Rinse your skin with warm water and to very gently remove the lemon components from your skin. Remember: Irritation can lead to acne, so always stay extremely gentle.
- Washing your skin and applying lemon juice (and oil) will leave your skin prone to dehydration. Acne-prone skin is clearest when it is balanced. Therefore, apply a moisturizer to keep your skin balanced.
Keep your expectations realistic: Even if the alpha hydroxy acids and other chemicals in lemons and lemon peels help with acne, they likely will not help to dramatically clear the skin. Therefore, do not look for this to completely clear your skin. Expect moderate improvement only.
- Cupane, M. Effects of some practices of citrus postharvest management on fruits quality and aromatic fingerprint. (Universita Delgi Studi Di Palermo, 2015). https://www.ncbi.nlm.nih.gov/pubmed/28052466
- Hsiao, Y. P. et al. Triggering apoptotic death of human epidermal keratinocytes by malic acid: Involvement of endoplasmic reticulum stress- and mitochondria-dependent signaling pathways. Toxins (Basel) 7, 81 – 96 (2015). https://www.ncbi.nlm.nih.gov/pubmed/25584429
- Shinkafi, S. & Ndanusa, H. Antibacterial activity of citrus lemon on acne vulgaris (pimples). Int J Sci Interv Today 2, 397 – 409 (2013). https://pdfs.semanticscholar.org/74f3/74e7aa23dd53e4660323a31d858c97fafa39.pdf
- Kim, S. S. et al. Biological activities of Korean Citrus obovoides and Citrus natsudaidai essential oils against acne-inducing bacteria. Biosci Biotechnol Biochem 72, 2507 – 13 (2008). https://www.ncbi.nlm.nih.gov/pubmed/18838824
- Bae, J. Y. & Park, S. N. Evaluation of anti-microbial activities of ZnO, citric acid and a mixture of both against Propionibacterium acnes. Int J Cosmet Sci 38, 550-557 (2016). https://www.ncbi.nlm.nih.gov/pubmed/26940755
- Sato, T. et al. A citrus polymethoxy flavonoid, nobiletin inhibits sebum production and sebocyte proliferation, and augments sebum excretion in hamsters. J Invest Dermatol 127, 2740 – 8 (2007). https://www.ncbi.nlm.nih.gov/pubmed/17597820
- Kornhauser, A., Coelho, S. G. & Hearing, V. J. Applications of hydroxy acids: classification, mechanisms, and photoactivity. Clin Cosmet Investig Dermatol 3, 135 – 142 (2010). https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3047947/
- Matthews, M. R., VanderVelde, J. C., Caruso, D. M., Foster, K. N. Lemons in the Arizona sunshine: The effects of furocoumarins leading to phytophotodermatitis and burn-like injuries. Wounds 29, E118-E124 (2017). https://www.ncbi.nlm.nih.gov/pubmed/29324427