What Actually Treats Hair Loss? The Evidence-Based Ingredients Explained

There is no shortage of products promising thicker, fuller hair. From caffeine shampoos to collagen powders and viral scalp oils, the options can feel endless.

But when it comes to treating hair loss – not just improving its appearance – only a small number of ingredients are supported by strong clinical evidence.

Doctors wish more people knew this:

• Hair loss is a medical condition.

• It requires medical, clinically-proven treatment.

• And not all ‘hair growth’ products are made equal.

This article explores the three key prescription-strength ingredients that are widely used in evidence-based hair loss treatment: Minoxidil, Finasteride and Dutasteride.

Why Most Hair Loss Products Don’t Treat Hair Loss

Many over-the-counter products focus on:

• Thickening existing hair

• Improving shine

• Reducing breakage

While these may improve appearance, they do not address:

• Follicle miniaturisation

• Hair follicle sensitivity to androgens

• Shortened hair growth cycles

To truly treat hair loss, an ingredient must act at the level of the hair follicle biology – not just the hair shaft.

1. Minoxidil: Stimulating the Growth Phase

Minoxidil is one of the most studied and widely prescribed treatments for hair loss.

What it does:

• Prolongs the growth (anagen) phase

• Improves blood flow to the follicle

• Stimulates follicles to produce thicker hair

Who it’s suitable for:

• Male pattern hair loss

• Female pattern hair loss

Minoxidil works by: 

1. Improving scalp circulation 

2. Reversing miniaturisation 

3. Prolonging the growth phase of the hair cycle 

4. Stimulating follicles to enter the active growth phase

Read more: What Is Minoxidil? A Simple Explanation

2. Finasteride: Blocking DHT

Finasteride is used primarily for male pattern hair loss.

What it does:

• Finasteride works by reducing the activity of the enzyme 5-alpha-reductase, which converts testosterone into DHT (dihydrotestosterone), the more active form of the hormone on the scalp.

• DHT is the hormone responsible for shrinking hair follicles in genetically susceptible individuals.

• By lowering DHT levels in the scalp, finasteride helps prevent further hair loss, preserve existing hair and promote regrowth.

Who it’s suitable for:

• Men with androgenetic alopecia

Read more: What Is Finasteride? A Simple Explanation

3. Dutasteride: A Stronger DHT Inhibitor 

Dutasteride works similarly to finasteride, but it blocks both Type I and II enzymes to reduce DHT. In contrast, finasteride acts primarily on Type II, reducing scalp DHT, though to a lesser extent than dutasteride. 

What it does:

• More comprehensive DHT suppression

• May be considered in all cases of pattern hair loss, but also for resistant or more advanced cases

Who it’s suitable for:

• Often considered when finasteride response is insufficient

Because it is more potent, supervision and suitability assessment are essential.

Read more: What Is Dutasteride? A Simple Explanation

4. Niacinamide: Supporting Scalp Health

Niacinamide (Vitamin B3) is not a DHT blocker or direct growth stimulator -  but it plays an important supportive role.

What it does:

• Reduces scalp inflammation

• Supports skin barrier function on scalp

• Improves microcirculation

• Enhances tolerance to other ingredients

A healthy scalp creates a better environment for follicles to respond to growth-stimulating treatments.

Why Combination Therapy Often Works Best

Hair loss rarely has a single mechanism.

For example:

• Pattern hair loss involves DHT + a shortened growth phase

This is why combination treatment – for example:

• Minoxidil + Finasteride

• Minoxidil + Niacinamide

• Finasteride + supportive scalp therapy

– can produce stronger, more stable outcomes.

Personalisation matters.

What About Side Effects?

All prescription treatments carry potential side effects – these are often:

• Manageable

• Dose-dependent

At Hair + Me we offer ongoing medical care if you need advice, support or a change in your treatment.

Side effects can often be mitigated by:

• Trying different ingredients

• Adjusting ingredient concentrations

• Altering treatment frequency

This is why personalised formulations can often lead to the best long-term outcomes.

Why Diagnosis Comes First

Before starting treatment, it’s important to identify:

• Is this pattern hair loss?
  
  

• Is it stress-related shedding?
  
  

• Is it postpartum hair loss?
  
  

• Is it menopause-related?
  
  

• Is it weight-loss-related?

Treating the wrong type of hair loss wastes time – and follicles.

Understanding the cause determines which combination of ingredients are most appropriate.

What About 'Natural' Remedies?

Many people search for:

• Natural hair loss cures

• Rosemary oil regrowth

• Supplements for hair growth

While some ‘natural’ ingredients may support scalp health, none match the clinical evidence behind prescription-strength ingredients.

Doctors don’t dismiss natural approaches – but they caution against relying solely on them to treat progressive pattern hair loss.

Final Thoughts

When it comes to treating hair loss, the evidence consistently points to a small number of ingredients:

• Minoxidil: stimulates growth
  
  

• Finasteride: blocks DHT
  
  

• Dutasteride: stronger DHT suppression
  
  

• Niacinamide: supports scalp health

Understanding how these ingredients work removes confusion – and helps you make informed decisions based on science, not trends.

Hair loss treatment shouldn't be about chasing false promises. It should be about using prescription ingredients that are scientifically proven.

References

1. Gupta AK, Talukder M, Venkataraman M, Bamimore MA. Minoxidil: a comprehensive review. J Dermatolog Treat. 2022 Jun;33(4):1896-1906.

2. Devjani S, Ezemma O, Kelley KJ, Stratton E, Senna M. Androgenetic Alopecia: Therapy Update. Drugs. 2023 Jun;83(8):701-715. 

3. Adil A, Godwin M. The effectiveness of treatments for androgenetic alopecia: A systematic review and meta-analysis. J Am Acad Dermatol. 2017 Jul;77(1):136-141.e5.

4. 4. Olsen EA, Hordinsky M, Whiting D, Stough D, Hobbs S, Ellis ML, Wilson T, Rittmaster RS; Dutasteride Alopecia Research Team. The importance of dual 5alpha-reductase inhibition in the treatment of male pattern hair loss: results of a randomized placebo-controlled study of dutasteride versus finasteride. J Am Acad Dermatol. 2006 Dec;55(6):1014-23.

5. Choi YH, Shin JY, Kim J, Kang NG, Lee S. Niacinamide Down-Regulates the Expression of DKK-1 and Protects Cells from Oxidative Stress in Cultured Human Dermal Papilla Cells. Clin Cosmet Investig Dermatol. 2021 Oct 18;14:1519-1528.