Contact Us
Need help with an order, return or product choice? Our Client Care team would be happy to help.
Email: hello@linetheory.co.uk
Monday–Friday, 9am–5pm UK time
For urgent order changes or cancellation requests, please email us as soon as possible. Once an order has been processed, changes may no longer be possible.
Telephone: 0207 965 7110

"I was tired of false lashes, glue, and the damage that came with them. Line Theory Lash Serum helped me feel better about my own lashes, which now look fuller and more natural."
"My lashes used to be one of my favourite features, but ageing made them look thin and short. Line Theory Lash Serum helped them look longer and more lush, and it gave me back a little confidence every morning."
"Since menopause, my lashes just weren’t the same. They looked thin, short, and tired, but after adding Line Theory's Lash Serum to my routine, my lashes look fuller and so much more feminine again."
Not sure which serum is right for you?
Choose Intensive if you want a more targeted performance formula. Choose Precision if you prefer a prostaglandin-free routine or have a more sensitive-feeling eye area.












