Chives, like  all the other members of the Allium/Onion family are thought to have some impact on high cholesterol and blood pressure.  An infusion can  be made and used daily, but it really does not taste so good !. The wise thing for blood pressure and high cholesterol is probably to just include members of the onion family in your diet at every opportunity.  Unfortunately, the down side to this is that allium compounds travel through the body when ingested and it takes time to process them out through sweat or breathing – chives is not as pungent as onion or garlic and so can often be taken when you don’t want to smell ! .....
The whole chives plant has a beneficial effect on the digestive system and the blood circulation. It improves the appetite, is digestive, hypotensive and tonic.
It can also be used as a fungicide or repellent. .
The juice of the plant is used as an insect repellent, it also has fungicidal properties and is effective against scab, mildew etc The growing plant is said to repel insects and moles and  it may well be true as I have had no trouble with either in the herb garden.