Yes that's true, but only medicinal cinnamon - there are two types each comes from a different tree species. You also need to add pepper, which isn’t common knowledge except if you have grown up with the typical Indian-style spices. The addition of pepper increase the digestion of turmeric and cinnamon by 10,000 times. This really means that without it you get very little. And preferably in an oil mixture - hence another reason for my preference for full-fat products in the drink. Here's an article from Harvard Health which you will find helpful. Thanks for the question, Walter

https://www.health.harvard.edu/staying-healthy/can-everyday-spices-make-you-healthier