CBD itself can modulate various receptors in the ECS, which can lead to an increase in anandamide and change how the ECS works. Unlike THC, CBD does not directly bind to CB1 and CB2 receptors.
However, full-spectrum CBD oil contains many other compounds found in the whole plant that can uniquely influence the ECS, which maximises its potential to support health and wellness. The minute THC content of full-spectrum CBD oil is not expected to bind to receptors in any meaningful way.