Why this matters: If you've had squamous cell carcinoma or actinic keratoses (precancerous spots), nicotinamide can reduce your risk of developing new skin cancers by up to 23%.
What is Nicotinamide?
Nicotinamide is a specific form of Vitamin B3 (also called niacinamide). It works differently from regular niacin and doesn't cause uncomfortable skin flushing. Research shows it helps your skin cells:
- Repair DNA damage caused by sun exposure
- Strengthen your skin's immune system
- Identify and clear precancerous cells before they become cancer
Important: You must use nicotinamide or niacinamide — NOT regular niacin or nicotinic acid. These other forms cause flushing and haven't been proven effective for skin cancer prevention.
Recommended Dosage & Instructions
| Timing | Dose | Instructions |
|---|---|---|
| Morning | 500 mg | Take with breakfast to reduce stomach upset |
| Evening | 500 mg | Take with dinner |
| Total Daily | 1000 mg | Available over-the-counter at most pharmacies |
What to Expect
Timing of Benefits
- Best results: When started early after your first skin cancer diagnosis
- Maximum protection: Achieved after taking consistently for several months
- Protection stops: Benefits disappear within 6 months of stopping the supplement
Good news: Clinical studies show a 23% reduction in new squamous cell carcinomas and a 20% reduction in actinic keratoses in high-risk patients.
Side Effects
Nicotinamide is generally very well tolerated. The most common side effects are:
- Mild stomach upset or nausea (taking with food helps)
- Occasional headache
- Rare digestive issues
Important Monitoring
Special considerations:
- Diabetes: Monitor blood sugar levels closely when starting, as nicotinamide can occasionally affect glucose control
- Kidney disease: Discuss with your doctor before starting — dosage may need adjustment
Regular Follow-Up Care
- Skin exams: Continue seeing your doctor or dermatologist every 3-6 months
- Self-checks: Examine your skin monthly for new or changing spots
- No routine blood tests needed: Unlike some medications, healthy individuals don't need regular lab monitoring
Action Plan Checklist
Getting Started
Remember: Nicotinamide is a prevention tool, not a cure. It works best as part of a complete sun-safe lifestyle that includes daily sunscreen (SPF 30+), protective clothing, and avoiding peak sun hours.
When to Contact Your Doctor
Call your healthcare provider if you experience:
- Persistent stomach upset or nausea
- Any new or changing skin spots
- If you have diabetes: unusual blood sugar readings
- Questions about continuing the supplement long-term
References
- Chen AC, Martin AJ, Choy B, et al. A Phase 3 Randomized Trial of Nicotinamide for Skin-Cancer Chemoprevention. N Engl J Med. 2015;373(17):1618-1626.
- Breglio KF, Geller AC, Braun RP, et al. Nicotinamide for Skin Cancer Chemoprevention: A Retrospective Cohort Study. JAMA Dermatol. 2025;161(11):1140-1147.
- Chen AC, Damian DL, Halliday GM. Oral nicotinamide for skin cancer chemoprevention in solid organ transplant recipients (ONTRANS): A randomised, double-blind, placebo-controlled, phase 3 trial. Lancet. 2023;402(10415):1815-1824.
- Surjana D, Halliday GM, Martin AJ, et al. Oral nicotinamide reduces actinic keratoses in phase II double-blinded randomized controlled trials. J Invest Dermatol. 2012;132(5):1497-1500.