Hair Growth & Hair Loss: Causes, Science & Evidence-Based Support

Hair Growth Cycle (Quick Overview)

Hair grows in three repeating stages:

• Anagen (Growth phase)
Active growth stage lasting years. Longer anagen = longer hair.

• Catagen (Transition phase)
Short phase where growth slows and follicles shrink.

• Telogen (Resting phase)
Hair naturally sheds and new strands begin forming.

Disruption in this cycle can lead to increased shedding or thinning.

Common Causes of Hair Loss

Genetic Hair Loss (Androgenetic Alopecia)

The most common cause of hair thinning. It is linked to genetics and hormone sensitivity, particularly to DHT (dihydrotestosterone), which can gradually shrink hair follicles.

Nutritional Deficiencies

Hair follicles require steady nutrient supply. Low levels of key nutrients may contribute to shedding:

• Iron

• Zinc

• Vitamin D

• Biotin

• Protein / amino acids

Stress & Lifestyle Factors

Stress can trigger temporary shedding (telogen effluvium). Contributing factors include:

• Poor sleep

• Rapid weight loss

• Chronic stress

• Smoking

• Poor diet

Hormonal Changes

Pregnancy, menopause, thyroid imbalance, and other hormonal shifts can impact hair density and growth cycles.

Ageing

Hair naturally becomes finer and growth slows with age due to reduced follicle activity.

Nutrition & Hair Health

Hair is primarily made of keratin, a structural protein that depends on adequate nutrition.

Key Nutrients

Biotin
Supports normal hair structure; deficiency may lead to brittleness.

Zinc
Important for follicle repair and protein synthesis.

Iron
Low iron is strongly associated with diffuse hair thinning.

Vitamin D
May support follicle cycling and growth regulation.

Protein
Essential for keratin production and hair strength.

Evidence-Informed Natural Ingredients

Saw Palmetto

Studied for its potential role in reducing DHT activity by inhibiting 5-alpha reductase, a key enzyme involved in androgenetic alopecia.

Pumpkin Seed Oil

Contains phytosterols and antioxidants. Research has explored its role in supporting hair count and thickness in men with pattern hair loss.

Multi-Ingredient Nutraceuticals

Many formulations combine:

• Saw palmetto

• Pumpkin seed oil

• Biotin

• Zinc

• Selenium

• Amino acids / collagen

These aim to support hair from multiple biological pathways.

Lifestyle Habits That Support Hair Health

Nutrition

A balanced diet supports long-term follicle health:

• Lean protein

• Eggs & fish

• Nuts & seeds

• Fruits & vegetables

Stress Management

Chronic stress may increase shedding. Helpful strategies include:

• Regular exercise

• Mindfulness or meditation

• Breathing techniques

Gentle Hair Care

Reduce unnecessary damage:

• Limit heat styling

• Avoid tight hairstyles

• Use gentle hair products

Sleep & Recovery

Good sleep supports hormone balance and cellular repair, both important for hair health.

Realistic Expectations

Hair growth is slow and cyclical. Most improvements from nutrition or supplements may take 3–6 months or longer to become noticeable.

Results vary based on:

• Underlying cause

• Consistency of use

• Overall health status

• Lifestyle habits

Choosing Quality Hair Supplements

When selecting hair health products, consider:

• Ingredient quality and dosage

• Scientific backing

• Manufacturing standards

• Transparency of formulation

• Brand reputation

Evidence-based, well-formulated products are more likely to support meaningful outcomes.

Final Summary

Hair loss is influenced by genetics, nutrition, hormones, stress, and ageing. While there is no single solution, research suggests that a combination of:

• Nutritional support

• Lifestyle improvements

• Evidence-based ingredients

may help support healthier hair growth and overall scalp health.

Individuals experiencing sudden or severe hair loss should seek professional medical advice.

Our Commitment to Quality

At Bodytonix, we carefully select premium hair-health products and nutraceuticals from trusted manufacturers that prioritise quality, safety, and evidence-based formulation.

Our selection process considers:

• Ingredient quality

• Scientific research

• Manufacturing standards

• Brand reputation

• Consumer outcomes

• Transparency in formulation

We partner with brands that meet recognised manufacturing standards and use high-quality ingredients to support consumer confidence.

About the Author

Bodytonix Research & Education Team

The Bodytonix Research & Education Team reviews emerging scientific literature and industry developments relating to nutritional supplements, healthy ageing, skin health, and hair wellness. Content is designed to support informed consumer decision-making based on current evidence.

All content is reviewed regularly for accuracy and relevance.

References

• Rossi A, et al. Comparative effectiveness of finasteride vs. Serenoa repens in androgenetic alopecia.

• Wessagowit V, et al. Efficacy of saw palmetto in androgenetic alopecia.

• Cho YH, et al. Pumpkin seed oil supplementation and hair growth in men.

• Almohanna HM, et al. Vitamins and minerals in hair loss.

• Trüeb RM. Molecular mechanisms of androgenetic alopecia.

Medical Disclaimer

This content is for educational purposes only and is not medical advice. Results may vary. Always consult a qualified healthcare professional before starting any supplement, especially if pregnant, breastfeeding, taking medication, or managing a medical condition.

Products sold by Bodytonix are not intended to diagnose, treat, cure, or prevent any disease.