The Complete Hair Care Guide — From Hair Loss Prevention to Healthy Hair

Hair Basics

Hair Structure

Medulla: the innermost core (present in thick hair)
Cortex: makes up the bulk; determines color and strength
Cuticle: the outer scale-like layer — when damaged, hair becomes brittle and frizzy

Healthy hair: a smooth, tightly closed cuticle reflects light → natural shine.

Hair Growth Cycle

Phase	Duration	Proportion
Anagen (growth)	2–7 years	85–90% of all hairs
Catagen (transition)	2–3 weeks	~1%
Telogen (resting)	~3 months	10–15%

Shedding 50–100 hairs per day is normal — those hairs re-enter the growth phase.

Types of Hair Loss and Their Causes

Androgenetic Alopecia (Pattern Hair Loss)

The most common form of hair loss in both men and women. Caused by DHT (dihydrotestosterone) shrinking hair follicles over time.

Male pattern: receding hairline at the temples, thinning at the crown
Female pattern: diffuse thinning across the top of the scalp, with the part widening
Genetics: your maternal grandfather’s hairline is often a rough predictor
Treatment is possible: early intervention produces the best results

Female-Specific Causes

Hormonal changes (thyroid disorders, menopause, birth control changes)
Iron deficiency anemia (one of the most common and overlooked causes)
Postpartum hair loss: heavy shedding 3–6 months after giving birth is normal and typically self-resolving

Alopecia Areata

Patchy, coin-shaped bald spots
Caused by an autoimmune response attacking hair follicles
Triggers: stress, immune dysfunction
Treatment: corticosteroid injections, topical immunotherapy, newer oral JAK inhibitors

Telogen Effluvium

Diffuse shedding that begins 2–3 months after a major physical or psychological stressor (surgery, illness, childbirth, extreme dieting, prolonged stress)
Usually self-resolves within 6–12 months once the trigger is addressed

Preventing Hair Loss

Scalp Circulation

Scalp massage: 5 minutes daily using your fingertips in circular motions
- A 2016 study found that 4 minutes of daily scalp massage over 24 weeks increased hair shaft thickness in participants
Exercise: improves whole-body circulation, including to the scalp

Nutrition

Nutrient	Role	Food Sources
Protein	Main structural component (keratin)	Eggs, chicken, legumes, Greek yogurt
Iron	Carries oxygen to follicles; enables growth	Red meat, spinach, lentils, fortified cereals
Biotin (B7)	Supports keratin synthesis	Eggs, almonds, sweet potato
Zinc	Regulates follicle oil glands; supports growth	Oysters, pumpkin seeds, beef
Vitamin D	Regulates the hair cycle	Fatty fish, eggs, sunlight, supplements
Omega-3 fatty acids	Reduces scalp inflammation	Salmon, sardines, flaxseed, walnuts

Crash dieting is a leading cause of hair loss. Dramatic calorie restriction triggers telogen effluvium. Gradual, sustainable weight management is far better for your hair.

Stress Management

Elevated cortisol shortens the anagen (growth) phase and pushes more hairs into the resting phase prematurely — a direct pathway from chronic stress to hair shedding.

How to Wash Your Hair Correctly

Choosing a Shampoo for Your Scalp Type

Scalp Type	Recommended Shampoo
Oily	Clarifying or deep-cleansing; may contain salicylic acid or zinc
Dry	Moisturizing; look for glycerin, argan oil, and sulfate-free formulas
Sensitive	Fragrance-free, preservative-free, gentle formulas
Dandruff	Active ingredients: ketoconazole, zinc pyrithione, or selenium sulfide

Washing Technique

Thoroughly wet your hair first (2–3 minutes under the water)
Lather the shampoo in your hands before applying — don’t pour it directly onto your scalp
Massage your scalp using your fingertip pads (not nails), working in gentle circles
Rinse thoroughly — residual shampoo is a leading cause of scalp irritation
Conditioner: apply from mid-shaft to ends only — avoid the scalp

Wash frequency: oily scalps can be washed daily; dry scalps do better with every 2–3 days.

Drying

Towel dry: blot and press, don’t rub — rubbing damages the cuticle
Heat protectant: non-negotiable before using any heat styling tool
Blow dryer distance: hold at least 6 inches from your scalp
Air drying: best for scalp health, but make sure hair is fully dry before sleeping (a damp scalp promotes dandruff and fungal growth)

Minimizing Heat Styling Damage

Safe Temperature Guidelines

Hair Type	Recommended Temperature
Fine or damaged hair	Under 300°F (150°C)
Normal hair	350°F (180°C)
Thick or coarse hair	Up to 390°F (200°C)

Above 450°F (230°C): irreversible protein denaturation and cuticle damage.

Heat protectant products containing silicones, keratin, or argan oil are essential whenever heat tools are used.

After Chemical Services

After a perm: avoid tying hair back and skip heat styling for 48 hours
After coloring: use color-safe shampoo; minimize UV exposure to prevent fading

Hair Masks and Deep Conditioning

Commercial Hair Masks

Use 1–2 times per week. Apply to hair (not scalp), leave for 5–15 minutes, rinse thoroughly.

DIY Treatments

Ingredients	Benefits
Egg yolk + olive oil	Protein boost and deep moisture
Avocado + coconut oil	Intensive hydration for dry, porous hair
Apple cider vinegar (diluted)	Smooths the cuticle and adds shine — use once weekly

Hair Loss Treatments

Topical and Oral Medications

Treatment	Who It’s For	Key Notes
Minoxidil (Rogaine)	Men and women; topical	Effects reverse if you stop using it
Finasteride (Propecia)	Men only; oral	Not safe for women who are or may become pregnant; rare sexual side effects
Dutasteride (Avodart)	Men only; oral; stronger than finasteride	Prescription required; not FDA-approved for hair loss but widely prescribed off-label

Minoxidil: available OTC in 2% (for women) and 5% (for men and women) formulations. Apply twice daily. Expect results at 3–6 months.

Hair Transplant Surgery

FUE (Follicular Unit Extraction): individual follicles harvested from the back and sides of the scalp; no linear scar
FUT (Follicular Unit Transplantation): a strip of scalp is excised, follicles separated, and transplanted; leaves a linear scar but can yield more grafts per session
Cost: typically $4,000–$ 15,000 in the US depending on graft count and clinic
Durability: transplanted follicles come from DHT-resistant donor areas — results are considered permanent

Other Treatments

PRP therapy (Platelet-Rich Plasma): injections of your own concentrated platelets into the scalp; stimulates follicle activity; typically a series of 3 sessions
Low-level laser therapy (LLLT): helmet-style devices and in-clinic lasers; improve scalp circulation and are FDA-cleared for hair loss
Supplements: biotin, zinc, iron, and vitamin D are beneficial when you are deficient — taking them beyond your needs offers little benefit

When to See a Specialist

Shedding noticeably more than 100 hairs per day consistently
Any patchy or circular bald spots
Thinning that has been worsening for 6+ months without an identifiable cause

Dermatologist or trichologist visit: a blood panel (ferritin, thyroid, vitamin D, zinc) can identify treatable underlying causes quickly. The earlier you start treating androgenetic alopecia, the more hair you can retain.

OIYO Editorial