Wash hands. Shake well before use.  Gently brush dry or damp hair.  Working in sections, liberally apply oil directly to the scalp & hair roots; gently massage and tap scalp with fingertips to evenly distribute.  Apply to hair ends as desired.  Leave in for a minimum of 1 to 12 hours (e.g. overnight for most intensive treatment).  For deeper and faster serum penetration, warm treated scalp briefly with hairdryer or headwrap.  Thoroughly shampoo scalp & hair with warm water, finish with a cold rinse.