A scalp-applied building block of the body's energy molecules that signals follicles to grow thicker hair and shed less. Its best-supported effect is thicker hair and less shedding; gains in overall hair count are smaller and less certain. Very gentle, easily obtained, and low-risk, but the evidence is thin and the true effect appears gradual. (Full Review)

Protocol

Formulation

0.75% lotion

Leave-on topical applied to the thinning scalp

Frequency

Twice daily

Split morning and evening on a dry or towel-dried scalp

Duration

6–12 months

Continuous use before judging response; benefits require ongoing application

Time to effect

Thicker hair

3–6 months

Measurable changes in hair thickness and density

Reduced shedding

Weeks to 2 months

Subjective reduction in shedding, noticed before regrowth

Full assessment

6–12 months

Fuller assessment of response to treatment

Benefits

Medium: Increased proportion of thick hair; reduced hair shedding and slowed loss

Low: Increased hair density; increased anagen hair rate

Speculative: Benefit in telogen effluvium and diffuse shedding; synergy with other topicals

Contraindications

Known allergy to a product's components

Active scalp dermatitis on the treatment area

Pregnancy or breastfeeding (precaution, pending data)

Key Interactions

Prescription topical hair treatments (minoxidil)

Over-the-counter topical products (caffeine, retinoid, ketoconazole shampoos)

Additive-effect agents (minoxidil, caffeine, possibly procyanidins)

Procedural treatments (microneedling, platelet-rich plasma)

Risk & Side Effects

Low: Local scalp irritation, redness, or itching; allergic contact dermatitis to formulation components

Speculative: Theoretical systemic effects from absorption; unknown safety in pregnancy and breastfeeding

Monitoring

Marker	Target	Why
Ferritin (iron stores)	~50–70+ ng/mL for hair	Low iron stores are a common, reversible cause of shedding
Vitamin D (25-OH)	~40–60 ng/mL	Deficiency is linked to hair-cycle disruption and shedding
TSH (thyroid-stimulating hormone)	~0.5–2.5 mIU/L (functional)	Thyroid imbalance causes diffuse hair loss
Zinc	Mid-to-upper normal	Deficiency contributes to hair loss and poor follicle function

Cadence: Reassess at ~3 months, 6 months, then every 6 months

Qualitative Assessment

Reduced daily shedding (fewer hairs on the pillow, in the shower drain, or on the brush)
Increased perceived hair thickness, fullness, or scalp coverage
Improved styling ease or reduced visibility of the scalp through the hair
Subjective confidence in the appearance of the hairline and crown over time

Adenosine for Hair Regrowth

Protocol

Benefits

Risk & Side Effects

Monitoring

Qualitative Assessment