India, April 14 -- A London woman has earned over $4 million in sales with a hair oil brand inspired by ancient Indian traditions. Erim Kaur is the influencer and entrepreneur behind ByErim - a luxury brand that sells a range of haircare products.

Its most popular product is its flagship hair growth oil, made with "100% natural and Ayurvedic ingredients." According to the ByErim website, the formula contains a blend of 8 oils, including amla oil, argan oil, coconut oil, sweet almond oil and castor oil.

Erim Kaur, 30, says her brand is a labour of love for people who grew up without mothers or sisters. Her own mother died of breast cancer when she was just 8.

"I think one of the strongest messages I've always had has been that I want to...