Spruce branch sprouts (kuusenkerkät) are loaded with vitamins and antioxidants. They’ve been used eaten as is or boiled to a drink. Minor vigor boost (maybe milder in-game boost than bear pipe?), easing fatigue, for respiratory ailments and oral hygiene. Limited harvest window few weeks some time during Swidden-Seedtime only.
Birch leaves and especially the budding new leaves have been used as medication to help with cleaning kidneys, and urinary tract; flushing toxins. Also a minor antiseptic. The sap has sugars, but only stays good for couple days. Boiled bark has been used as medication for skin ailments. Fresh buds are highly effective, later summer (hay month and later) the effects are almost disappeared.
Aspen bark, buds and fresh new leaves are antiseptic, reducing inflammation and infections, and fever reducer.
There are many more tree products with similar beneficial effects.