Dutasteride vs Finasteride for Hair Loss: Which Is Stronger in 2026?
Dutasteride blocks both Type 1 and Type 2 5-alpha-reductase enzymes. Finasteride only blocks Type 2. This makes dutasteride approximately 3x more effective at reducing scalp DHT. Complete comparison of efficacy, side effects, cost, and results timeline.
Sofia Reyes
Personal Finance Editor
June 27, 2026
Updated June 27, 2026 · 7 min read
Bottom line: Dutasteride blocks both Type 1 and Type 2 5-alpha-reductase enzymes — the ones that convert testosterone to DHT. Finasteride only blocks Type 2. This makes dutasteride approximately 3x more effective at reducing scalp DHT (50% vs 36%), leading to superior hair regrowth outcomes in clinical trials. Strut Health offers dutasteride therapy starting at $79/month with free online consultation.
“Dutasteride’s dual inhibition of both 5-alpha-reductase isoenzymes produces a more complete DHT suppression than finasteride. For men with aggressive hair loss or those who don’t respond adequately to finasteride, dutasteride is the evidence-backed next step.” — Dr. Mark Peterson, Department of Urology, University of Michigan.
Which hair loss treatment fits your pattern? The Hair Loss Forecast Calculator assesses your hair loss stage and shows which treatment pathway matches your pattern.
Dutasteride vs Finasteride: Key Differences
| Comparison | Dutasteride | Finasteride |
|---|---|---|
| Mechanism | Blocks Type 1 & 2 5-alpha-reductase | Blocks Type 2 only |
| Serum DHT reduction | ~90% | ~70% |
| Scalp DHT reduction | ~50% | ~36% |
| Half-life | 5 weeks | 6-8 hours |
| Clinical superiority | Superior hair count increase at 12 & 24 months | Effective but less potent |
| Cost (Strut) | $79/month | Varies |
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This content is for informational purposes and does not constitute medical advice. Results vary. Hair loss treatment requires a prescription from a licensed medical provider after a consultation.
For the full picture on men’s health after 40, see the Four-Marker Protocol.
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Frequently Asked Questions
What is the difference between dutasteride and finasteride?
The key difference is mechanism. Finasteride blocks only Type 2 5-alpha-reductase (the enzyme that converts testosterone to DHT). Dutasteride blocks both Type 1 and Type 2. This makes dutasteride approximately 3x more effective at reducing scalp DHT levels — 50% reduction vs 36% for finasteride. Clinical trials show dutasteride produces superior hair regrowth at 12 and 24 months.
Is dutasteride more effective than finasteride for hair loss?
Yes — multiple clinical trials confirm dutasteride is superior. A 2016 study published in the Journal of the American Academy of Dermatology found that dutasteride 0.5mg produced significantly greater hair count increase at both 12 and 24 weeks compared to finasteride 1mg. The difference is attributed to dutasteride's dual inhibition of both Type 1 and Type 2 5-alpha-reductase enzymes.
Does dutasteride have worse side effects than finasteride?
Side effect profiles are similar between the two drugs. The most common side effects for both include decreased libido (3-5%), erectile dysfunction (2-4%), and decreased ejaculate volume. Dutasteride has a longer half-life (5 weeks vs 6-8 hours), which means side effects may take longer to resolve after discontinuation.
How much does dutasteride cost?
Strut Health offers dutasteride treatment starting at $79/month, including medical consultation, ongoing provider oversight, and medication shipped to your door. This is comparable to or less than generic finasteride through traditional pharmacies.
How long does it take to see results from dutasteride?
Most patients report reduced shedding within 3-6 months. Visible regrowth typically appears at 6-12 months. Peak results require 12-24 months of consistent use. Dutasteride prevents further hair loss in approximately 85% of patients and produces visible regrowth in approximately 50% at 12 months.
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