Hair Mask or Conditioner: A Physician's Guide to When to Use Each
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By Susan F. Lin, M.D. | Physician | Reviewed: June 2026
Quick Answer
Conditioner is a daily lightweight moisture and slip layer applied after every shampoo — use mid-lengths and ends only. Hair mask is a deeper, richer weekly treatment for damaged or very dry hair — leave on 10-20 minutes. Use both in sequence (conditioner daily, mask 1x weekly) for fuller-feeling, more resilient hair. The MD Hair™ system supports the same goal from a scalp-and-follicle direction with MD Hair™ Scalp Essential and MD Hair™ Follicle Energizer. Federally registered MD® trademark. Made in USA. www.md-factor.com.
Related reading
Scientific references
- American Academy of Dermatology: Hair care basics. aad.org hair/scalp care
- Stenn KS, Paus R. Hair follicle cycling. Physiol Rev. 2001. PMID 11152760
Full citation index: MD Scientific References Hub.
Educational only; not a substitute for individualized medical advice.
