Orange Peel

"The orange peel polar fraction extract containing a compound called feruloylputrescine has the potential to alleviate cardiovascular disease.
When they feed on certain nutrients during digestion, gut bacteria produce trimethylamine N-oxide (TMAO). Levels of TMAO can help predict future cardiovascular disease.

They tested two types of extracts: 

a polar fraction and a non-polar fraction.

To get the polar fractions, they used polar and non-polar solvents to extract the orange peel.
“If you imagine your salad dressing, anything in the water or vinegar part are the polar fraction; anything in the oil away from water is the non-polar fraction,” Dr. Wang said.
The authors found that the orange peel non-polar fraction extract

effectively inhibits the production of harmful chemicals.
“This is a novel finding that highlights the previously unrecognized health potential of feruloylputrescine in reducing the risk of cardiovascular disease,” Dr. Wang said.
“The orange peel finding is significant because 5 million tons of orange peels are produced each year in orange juice production nationwide.”
“These findings suggest that orange peels, often discarded as waste in the citrus industry, can be repurposed into valuable health-promoting ingredients, such as diet supplements or food ingredients,” Dr. Wang said."
SciNews