The olive leaf contains a wide phenolic profile, of which the major elements are shown below: 

• Oleuropein
• Hydroxytyrosol
• Rutin
• Catechin
• Luteolin
• Diosmetin
• Caffeic acid
• Verbascoside
• Vanillic acid
• Tyrosol
• Vanillin

The two most prominent biophenols found in olive leaf extract are oleuropein and hydroxytyrosol.¹

Reference

1. Vogel P, Machado I, Garavaglia J, et al. Polyphenol benefits of olive leaf (Olea europaea L.) to human health. Nutr Hosp. 2015;31(3):1427–33.