Dear Sir/Madam,
In treating hair loss, both types of oil are used by rubbing into the scalp, and/or hair root. Apricot kernel oil is cold pressed oil and may be used separately, while rosemary oil is essential oil which must be diluted with other type of oil before use. It is good to mix these two types of oil in the proportion of 4-5:1 in favour of the apricot kernel oil.
Kind regards!