💡 What You Need to Know Right Away
- Tea tree oil demonstrates efficacy comparable to conventional treatments for mild to moderate acne lesions, with a favorable safety profile when properly diluted.[Evidence: A][1]
- Zinc supplementation (30-40 mg daily) significantly improves inflammatory papule count in patients with low serum zinc levels.[Evidence: A][3]
- Green tea extract containing EGCG polyphenols reduces acne lesions by modulating sebum production and inflammatory response.[Evidence: A][2]
- Nigella sativa (black seed) hydrogel achieves 78% reduction in acne severity scores through thymoquinone's NF-κB inhibition.[Evidence: B][5]
Acne affects up to 85% of people between ages 12 and 24, and the search for effective treatments can feel overwhelming. Many people worry about the side effects of prescription medications or simply prefer natural alternatives that align with their wellness values.
The good news is that scientific research has validated several natural remedies for acne. A 2023 systematic review published in JAMA Dermatology evaluated 42 clinical trials on oral nutraceuticals for acne, finding good evidence for vitamin D, green tea extract, probiotics, and zinc.[Evidence: A][12]
This guide examines 13 natural remedies with clinical evidence, explains how they work, provides safe dosage guidelines, and helps you understand when natural treatments are appropriate versus when to seek medical care.
❓ Quick Answers
What are natural remedies for acne?
Natural remedies for acne are plant-based or naturally-derived treatments used to reduce acne lesions, control oil production, and prevent breakouts. These include topical treatments like tea tree oil, aloe vera, and honey, as well as oral supplements such as zinc, vitamin D, and probiotics. They work by targeting acne-causing bacteria, reducing inflammation, and regulating sebum.[Evidence: A][12]
Do natural remedies for acne actually work?
Some natural remedies have strong clinical evidence. A systematic review of 42 studies found that zinc, vitamin D, green tea extract, and probiotics show good evidence for acne treatment.[Evidence: A][12] Tea tree oil has been shown effective in multiple randomized controlled trials for mild to moderate acne.[Evidence: A][1]
How do natural acne remedies work?
Natural acne remedies work through several mechanisms: antimicrobial action against Cutibacterium acnes bacteria, anti-inflammatory effects that reduce redness and swelling, sebum regulation to control oil production, and wound healing to minimize scarring. For example, thymoquinone in black seed inhibits NF-κB inflammatory pathways.[Evidence: B][5]
What are the benefits of natural acne treatments?
Benefits include fewer side effects compared to prescription medications, no antibiotic resistance concerns, accessibility without prescription, and multi-target action. A meta-analysis found green tea reduces acne lesions while modulating sebum production.[Evidence: A][2] Zinc supplementation improves inflammatory papules in deficient patients.[Evidence: A][3]
How much zinc should I take for acne?
Clinical trials support 30-40 mg of elemental zinc daily for 12 weeks in patients with acne and low serum zinc levels.[Evidence: A][3] Do not exceed 40 mg daily due to copper absorption interference. Take zinc with food to minimize gastrointestinal side effects.
Is tea tree oil safe for acne?
Tea tree oil is relatively safe when properly diluted (1:9 ratio with carrier oil). Adverse events are primarily allergic contact dermatitis in predisposed individuals. Oxidation products (ascaridole, terpinolene) are major sensitizers, so store in dark glass containers away from heat.[Evidence: D][15] Never apply undiluted or ingest tea tree oil.
How long does it take for natural remedies to clear acne?
Most clinical trials show initial improvement at 4-8 weeks with continued benefits over 8-12 weeks. Nigella sativa hydrogel achieved 78% improvement in 60 days.[Evidence: B][5] Oral probiotics showed 50% improvement rate over the treatment period.[Evidence: B][13] Consistency is essential for results.
Natural
Acne Solutions
Harness the power of botanical science. Explore 10 evidence-based natural remedies to soothe inflammation and clear your complexion.
🔬 How Do Natural Remedies Work for Acne?
Understanding how natural remedies target acne helps you choose the right treatment. Acne develops through four interconnected processes: excess sebum production, follicular hyperkeratinization (clogged pores), Cutibacterium acnes bacterial colonization, and inflammation. Different natural remedies target different parts of this cascade.
Think of acne like a four-lock door. Each lock represents one of these processes. Prescription medications often target just one or two locks, while combining natural remedies can address all four simultaneously.
Antimicrobial Action
Tea tree oil contains terpinen-4-ol, which kills C. acnes bacteria by disrupting their cell membranes. A systematic review of randomized controlled trials confirms this antibacterial efficacy translates to clinical acne reduction.[Evidence: A][1] Azelaic acid demonstrates antimicrobial activity against C. acnes without promoting antibiotic resistance.[Evidence: A][8] Kanuka honey contains methylglyoxal, which provides antibacterial effects against acne-associated bacteria.[Evidence: B][10]
Anti-Inflammatory Pathways
Inflammation causes the redness, swelling, and pain of acne lesions. Multiple natural compounds target the NF-κB inflammatory pathway. Thymoquinone from Nigella sativa inhibits NF-κB activation, achieving 78% improvement in acne severity.[Evidence: B][5] Curcumin from turmeric demonstrates anti-inflammatory and antioxidant effects through the same NF-κB inhibition mechanism.[Evidence: D][11]
Topical vitamin D reduces inflammatory lesions by decreasing IL-1β levels directly in acne lesions.[Evidence: B][14] Oral probiotics modulate systemic IL-10 levels through the gut-skin axis, achieving 50% improvement versus 29.4% with placebo.[Evidence: B][13]
Sebum Regulation
Picture sebaceous glands as tiny faucets. When they produce too much oil, pores overflow and clog. Green tea's EGCG polyphenols help turn down these faucets. A meta-analysis of randomized clinical trials confirms green tea extract reduces acne lesions by modulating sebum production and inflammatory response.[Evidence: A][2]
Salicylic acid works as a keratolytic agent, unclogging pores while decreasing sebum levels by 23.65% and increasing skin hydration by 40.5% over 21 days.[Evidence: B][7]
Skin Barrier Support
Probiotic-derived ingredients support the skin microbiome. A topical probiotic lotion from Lactobacillus paracasei modulates immune response and skin microbiome, demonstrating efficacy comparable to 2.5% benzoyl peroxide.[Evidence: B][6] Aloe vera combined therapy improves skin roughness and local blood circulation while reducing papules and hyperpigmented lesions.[Evidence: B][9]
📊 Dosage and How to Use Natural Acne Remedies
Proper dosing is critical for both effectiveness and safety. The following dosages come from clinical trials and systematic reviews.
| Remedy | Dosage | Duration | Evidence |
|---|---|---|---|
| Zinc (oral) | 30-40 mg elemental zinc daily | 12 weeks | [A][3] |
| Vitamin D (oral) | 0.25 µg alfacalcidol daily | 3 months | [B][4] |
| Vitamin D (topical) | 50 mcg cholecalciferol | 8 weeks | [B][14] |
| Nigella sativa hydrogel | 2% thymoquinone, twice daily | 60 days | [B][5] |
| Salicylic acid gel | Topical application twice daily | 21 days | [B][7] |
| Tea tree oil | 5% diluted in carrier oil | 8-12 weeks | [A][1] |
| Green tea extract | Up to 1500 mg daily (oral) | 4+ weeks | [A][2] |
Important Dosing Notes
- Zinc: Take with food to prevent nausea. Do not exceed 40 mg daily to avoid copper deficiency. Choose zinc gluconate, zinc sulfate, or zinc picolinate forms.
- Tea tree oil: NEVER apply undiluted. Mix 1 part tea tree oil with 9 parts carrier oil (jojoba, coconut, or almond oil). Perform patch test before first use.
- Vitamin D: Test serum 25(OH)D levels before supplementing. Levels correlate with acne severity.[Evidence: B][4]
- Green tea: Oral supplementation well-tolerated at 1500 mg/day for 4 weeks with no reported adverse effects.[Evidence: A][2]
⚠️ Risks, Side Effects, and Warnings
⚠️ Important Safety Information
- Tea tree oil may cause allergic contact dermatitis in predisposed individuals. Oxidation products (ascaridole, terpinolene, α-terpinene, limonene) are major sensitizers.[15]
- Zinc supplements above 40 mg daily may interfere with copper absorption and cause deficiency with prolonged use.
- Consult your healthcare provider before combining natural remedies with prescription acne medications.
- Pregnant and breastfeeding women should avoid oral aloe latex and high-dose supplements.
Side Effects by Remedy
Tea Tree Oil: Adverse events are primarily allergic contact dermatitis. Risk is minimized through proper dilution (1:9 ratio) and appropriate storage in dark containers away from heat and light.[Evidence: D][15]
Zinc Supplements: Gastrointestinal adverse effects reported but no serious outcomes in clinical trials. Upper limit is 40 mg/day.[Evidence: A][12] Take with food to minimize stomach upset.
Green Tea Extract: Well-tolerated orally at 1500 mg/day for 4 weeks with no reported adverse effects in meta-analysis data.[Evidence: A][2]
Vitamin D: No adverse effects reported in supplementation trials at studied doses.[Evidence: B][4] Monitor for hypercalcemia with high-dose oral supplementation.
Azelaic Acid: FDA-approved for acne in 15-20% formulations. Pregnancy Category B, considered safe during pregnancy.[Evidence: A][8]
Drug Interactions
- Zinc + Tetracycline antibiotics: Zinc may reduce tetracycline absorption. Separate doses by at least 2 hours.
- Probiotics + Doxycycline: No negative interactions documented. Potential synergy reported.
- Topical natural remedies: No significant systemic interactions documented due to minimal absorption.
Who Should NOT Use Natural Acne Remedies Without Medical Supervision
- Individuals with history of contact dermatitis or atopic dermatitis (avoid tea tree oil)
- Pregnant women (avoid oral aloe latex, high-dose vitamin A derivatives)
- People with copper deficiency (avoid zinc supplementation above RDA)
- Those on isotretinoin or other prescription retinoids (potential interactions)
🥗 Practical Ways to Use Natural Remedies for Acne
How to Use This in Your Daily Life
Scenario 1: Mild to Moderate Inflammatory Acne
- Dose: Salicylic acid gel twice daily[7]
- Duration: 21 days initial, continue as maintenance
- Population: Adults with oily skin and inflammatory lesions
- Timing: Apply morning and evening after cleansing
- What to track: Sebum levels, lesion count
- Expected results: 23.65% sebum reduction, 40.5% hydration increase[7]
Scenario 2: Acne with Low Serum Zinc
- Dose: 30-40 mg elemental zinc daily[3]
- Duration: 12 weeks
- Population: Adults with confirmed low serum zinc levels
- Timing: With meals to minimize GI upset
- What to track: Inflammatory papule count
- Expected results: Significant improvement in inflammatory lesions[3]
Scenario 3: Acne with Vitamin D Deficiency
- Dose: 0.25 µg alfacalcidol daily (oral) OR 50 mcg cholecalciferol (topical)[4][14]
- Duration: 8-12 weeks
- Population: Acne patients with 25(OH)D deficiency
- Timing: Oral with fatty meal for absorption; topical as directed
- What to track: Inflammatory lesion count, serum vitamin D levels
- Expected results: Reduced inflammatory lesions through IL-1β reduction[14]
Practical Integration
Take oral supplements (zinc, vitamin D) with breakfast. Apply topical treatments (salicylic acid, tea tree oil) after morning and evening cleansing. Allow 5 minutes between different topical products. Store tea tree oil in dark glass bottles in a cool, dry place away from direct sunlight to prevent oxidation.
Common Mistakes to Avoid
- Applying undiluted tea tree oil: Concentrations above 10% increase irritation risk. Always dilute 1:9 with carrier oil.[15]
- Inconsistent dosing: Studies used daily dosing for 8-12 weeks. Sporadic use may not achieve benefits.
- Skipping patch tests: Apply diluted product to inner forearm, wait 24 hours, check for redness or irritation before facial use.
- Expecting overnight results: Most studies show improvement at 4-8 weeks. Be patient and consistent.
⚖️ Natural Remedies vs. Prescription Acne Treatments
Natural remedies work best for mild to moderate acne. Severe or cystic acne typically requires prescription medications. Here's an evidence-based comparison.
| Feature | Natural Remedies | Benzoyl Peroxide | Prescription Retinoids |
|---|---|---|---|
| Effectiveness | Mild to moderate acne | Mild to moderate acne | Moderate to severe acne |
| Evidence Level | A-B (multiple meta-analyses) | A (gold standard) | A (gold standard) |
| Time to Results | 4-12 weeks | 2-4 weeks | 8-12 weeks |
| Side Effects | Generally mild (contact dermatitis, GI upset) | Dryness, peeling, irritation | Dryness, photosensitivity, teratogenicity |
| Antibiotic Resistance | No concern | No concern | N/A (not antibiotic) |
| Prescription Required | No | No (OTC available) | Yes |
| Cost (monthly) | $8-20 | $10-25 | $50-200+ |
When Natural Remedies Are Appropriate
- Mild acne with occasional breakouts
- Preference for natural/botanical treatments
- Concerns about antibiotic resistance
- Supplement to prescription treatment (with provider approval)
- Patients with documented nutrient deficiencies (zinc, vitamin D)
When to Choose Prescription Treatments
- Moderate to severe inflammatory acne
- Cystic or nodular acne
- Acne causing scarring
- No improvement after 12 weeks of natural remedies
- Hormonal acne requiring systemic treatment
Probiotic lotion demonstrated efficacy comparable to 2.5% benzoyl peroxide for mild to moderate acne, suggesting some natural options can match conventional OTC treatments.[Evidence: B][6] Azelaic acid, while naturally derived from grains, is FDA-approved and available in prescription-strength formulations.[Evidence: A][8]
What The Evidence Shows (And Doesn't Show)
What Research Suggests
- Tea tree oil demonstrates efficacy for mild to moderate acne lesions with a favorable safety profile when properly diluted, supported by systematic review of RCTs.[Evidence: A][1]
- Zinc supplementation (30-40 mg daily for 12 weeks) significantly improves inflammatory papule count in patients with low serum zinc, confirmed by meta-analysis.[Evidence: A][3]
- Green tea EGCG polyphenols reduce acne lesions by modulating sebum production, supported by meta-analysis of randomized clinical trials.[Evidence: A][2]
- Nigella sativa hydrogel achieves 78% reduction in acne severity scores over 60 days of twice-daily use.[Evidence: B][5]
- Oral probiotics achieve 50% improvement rate versus 29.4% placebo through gut-skin axis modulation.[Evidence: B][13]
What's NOT Yet Proven
- Optimal dosages not established for most topical natural remedies. Studies used varying concentrations of tea tree oil (5-15%) with different results.
- Long-term safety beyond 12 weeks unclear for most interventions. Longest study duration was 60 days for Nigella sativa.
- Head-to-head comparisons between natural remedies are limited. We cannot definitively rank which is "best."
- Populations not studied: Children under 12, pregnant women, and elderly patients largely excluded from trials.
- Severe acne evidence lacking: Most studies focused on mild to moderate acne. No evidence supports natural remedies for cystic/nodular acne.
- Niacinamide, DIM, evening primrose oil popularly recommended but lack dedicated RCTs in the current evidence base.
Where Caution Is Needed
- Tea tree oil oxidation products (ascaridole, terpinolene) are sensitizers causing contact dermatitis. Store properly and discard old product.[15]
- Zinc supplementation above 40 mg/day risks copper deficiency with prolonged use. Monitor if taking long-term.
- Quality varies significantly between supplement brands. Look for third-party testing (USP, NSF, ConsumerLab).
- Combining keratolytics (salicylic acid + retinoids) may cause excessive irritation. Introduce gradually.
- Oral aloe latex contraindicated in pregnancy. Topical aloe vera gel considered safe.
Should YOU Try This?
Best suited for: Adults with mild to moderate acne seeking alternatives to conventional treatments, those with documented zinc or vitamin D deficiencies, individuals concerned about antibiotic resistance, and patients wanting to supplement prescription treatments (with provider approval).
Not recommended for: Severe cystic or nodular acne (requires prescription treatment), pregnant or breastfeeding women without medical supervision, individuals with history of contact dermatitis (avoid tea tree oil), and those expecting rapid overnight results.
Realistic timeline: Initial improvement typically visible at 4-8 weeks. Full results require 8-12 weeks of consistent use. Nigella sativa achieved 78% improvement at 60 days.[5] Salicylic acid shows sebum reduction within 21 days.[7]
When to consult a professional: Before starting if you have moderate to severe acne, are pregnant or breastfeeding, take prescription medications, have underlying health conditions, or see no improvement after 12 weeks of consistent natural remedy use.
Frequently Asked Questions
Can I use natural acne remedies with prescription treatments?
Many natural remedies can be safely combined with prescription acne treatments, though you should consult your healthcare provider first. Zinc supplements do not interfere with topical retinoids. Probiotics show potential synergy with oral antibiotics like doxycycline. However, avoid combining multiple keratolytic agents (salicylic acid with prescription retinoids) without medical guidance, as this may cause excessive dryness and irritation. The systematic review of oral nutraceuticals found most interventions well-tolerated with minimal adverse effects when used appropriately.
What natural remedy works best for hormonal acne?
For hormonal acne, zinc supplementation and vitamin D show the strongest evidence. Serum zinc levels are often lower in acne patients, and supplementation significantly improves inflammatory papules. Vitamin D deficiency correlates with acne severity, and supplementation reduces inflammatory lesions. Oral probiotics targeting the gut-skin axis achieved 50% improvement rates by modulating IL-10 levels. DIM and evening primrose oil are popularly recommended but lack robust clinical trial data in the current evidence base.
Are natural remedies as effective as benzoyl peroxide?
For mild to moderate acne, certain natural remedies approach benzoyl peroxide effectiveness. A probiotic-derived lotion from Lactobacillus paracasei demonstrated efficacy comparable to 2.5% benzoyl peroxide in a randomized controlled trial. Tea tree oil systematic reviews confirm efficacy for mild to moderate reductions in acne lesions. However, benzoyl peroxide remains a gold standard with decades of evidence, particularly for moderate acne. Natural remedies may take longer to show results (4-12 weeks versus 2-4 weeks).
What are the side effects of natural acne treatments?
Side effects vary by remedy. Tea tree oil may cause allergic contact dermatitis, especially in those with atopic dermatitis or when using oxidized product. Zinc supplements cause gastrointestinal effects (nausea, stomach upset) but no serious outcomes in clinical trials. Green tea extract was well-tolerated at 1500 mg daily with no reported adverse effects. Overall, natural remedies have favorable safety profiles compared to prescription medications when used at recommended doses.
Can I use multiple natural remedies together?
Yes, combining complementary natural remedies can address multiple acne pathways simultaneously. For example, oral zinc (anti-inflammatory, immune support) can be combined with topical tea tree oil (antimicrobial) and salicylic acid (keratolytic). This multi-target approach mirrors dermatological combination therapy principles. However, introduce one new product at a time, waiting 1-2 weeks between additions to identify any adverse reactions. Avoid layering multiple potentially irritating topicals on the same area. The evidence supports individual remedies; combination protocols require careful personalization.
What natural remedies help with acne scars?
For post-inflammatory hyperpigmentation and scarring, aloe vera combined therapy improves hyperpigmented lesions and skin texture. Azelaic acid is FDA-approved and effective for both active acne and post-inflammatory hyperpigmentation due to its tyrosinase-inhibiting properties. Rosehip oil and vitamin E are commonly recommended for scars but lack robust clinical trials for acne-specific scarring. For deep or pitted scars, professional treatments (chemical peels, microneedling, laser) are more effective than topical natural remedies alone.
How do probiotics help acne through the gut-skin axis?
Probiotics influence acne through the gut-skin axis by modulating systemic inflammation. An oral probiotic containing Lacticaseibacillus rhamnosus achieved 50% improvement rate versus 29.4% with placebo by modulating systemic IL-10 levels. Topical probiotics also help by supporting the skin microbiome directly. A lotion derived from Lactobacillus paracasei modulates immune response and shows efficacy comparable to benzoyl peroxide. Probiotic interventions were well-tolerated in RCTs with no significant adverse events.
When should I see a doctor for acne instead of using natural remedies?
See a dermatologist if you have: moderate to severe inflammatory acne with many papules and pustules, cystic or nodular acne (deep painful lumps), acne causing scarring, no improvement after 12 weeks of consistent natural remedy use, signs of infection (increasing redness, warmth, pus), acne significantly affecting your mental health or quality of life. Severe acne requires prescription medications like isotretinoin, oral antibiotics, or hormonal treatments that natural remedies cannot replace. Early dermatological intervention prevents permanent scarring.
Our Accuracy Commitment and Editorial Principles
At Biochron, we take health information seriously. Every claim in this article is supported by peer-reviewed scientific evidence from reputable sources published in 2015 or later. We use a rigorous evidence-grading system to help you understand the strength of research behind each statement:
- [Evidence: A] = Systematic review or meta-analysis (strongest evidence)
- [Evidence: B] = Randomized controlled trial (RCT)
- [Evidence: C] = Cohort or case-control study
- [Evidence: D] = Expert opinion or clinical guideline
Our editorial team follows strict guidelines: we never exaggerate health claims, we clearly distinguish between correlation and causation, we update content regularly as new research emerges, and we transparently note when evidence is limited or conflicting. For our complete editorial standards, visit our Editorial Principles page.
This article is for informational purposes only and does not constitute medical advice. Always consult qualified healthcare professionals before making changes to your health regimen, especially if you have medical conditions or take medications.
References
- 1 . Efficacy and safety of Melaleuca alternifolia (tea tree) oil for human health-A systematic review of randomized controlled trials, Frontiers in Pharmacology, 2023, DOI | PubMed [Evidence: A]
- 2 . The effects of green tea on acne vulgaris: A systematic review and meta-analysis of randomized clinical trials, Phytotherapy Research, 2021, DOI | PubMed [Evidence: A]
- 3 . Serum zinc levels and efficacy of zinc treatment in acne vulgaris: A systematic review and meta-analysis, Dermatologic Therapy, 2020, DOI | PubMed [Evidence: A]
- 4 . The impact of active vitamin D administration on the clinical outcomes of acne vulgaris, Journal of Dermatological Treatment, 2021, DOI | PubMed [Evidence: B]
- 5 . The effect of a hydrogel made by Nigella sativa L. on acne vulgaris: A randomized double-blind clinical trial, Phytotherapy Research, 2020, DOI | PubMed [Evidence: B]
- 6 . Efficacy of probiotic-derived lotion from Lactobacillus paracasei MSMC 39-1 in mild to moderate acne vulgaris, randomized controlled trial, Journal of Cosmetic Dermatology, 2022, DOI | PubMed [Evidence: B]
- 7 . Clinical Efficacy of a Salicylic Acid-Containing Gel on Acne Management and Skin Barrier Function: A 21-Day Prospective Study, Journal of Cosmetic Dermatology, 2025, DOI | PubMed [Evidence: B]
- 8 . A systematic review to evaluate the efficacy of azelaic acid in the management of acne, rosacea, melasma and skin aging, Journal of Cosmetic Dermatology, 2023, DOI | PubMed [Evidence: A]
- 9 . Efficacy of a New Non-drug Acne Therapy: Aloe Vera Gel Combined With Ultrasound and Soft Mask for the Treatment of Mild to Severe Facial Acne, Frontiers in Medicine, 2021, DOI | PubMed [Evidence: B]
- 10 . Randomised controlled trial of topical kanuka honey for the treatment of acne, BMJ Open, 2016, DOI | PubMed [Evidence: B]
- 11 . Potential of Curcumin in the Management of Skin Diseases, International Journal of Molecular Sciences, 2024, DOI | PubMed [Evidence: D]
- 12 . Safety and Effectiveness of Oral Nutraceuticals for Treating Acne: A Systematic Review, JAMA Dermatology, 2023, DOI | PubMed [Evidence: A]
- 13 . A Randomized Clinical Trial to Evaluate the Efficacy of an Oral Probiotic in Acne Vulgaris, Acta Dermato-Venereologica, 2024, DOI | PubMed [Evidence: B]
- 14 . Correlation Between Reduced IL-1β Levels in Acne Lesions and the Decrease in Acne Inflammatory Lesions Following Topical Vitamin D Administration, Clinical, Cosmetic and Investigational Dermatology, 2024, DOI | PubMed [Evidence: B]
- 15 . Safety assessment and adverse drug reaction reporting of tea tree oil (Melaleuca aetheroleum), Phytotherapy Research, 2023, DOI | PubMed [Evidence: D]
Medical Disclaimer
This content is for informational and educational purposes only. It is not intended to provide medical advice or to take the place of such advice or treatment from a personal physician. All readers are advised to consult their doctors or qualified health professionals regarding specific health questions and before making any changes to their health routine, including starting new supplements.
Neither Biochron nor the author takes responsibility for possible health consequences of any person reading or following the information in this educational content. All readers, especially those taking prescription medications, should consult their physicians before beginning any nutrition, supplement, or lifestyle program.
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