I have an idea to improve system of primitive medicine.
1. Add new workstation distiller (boards, hard metal, logs, clay, cloth, coal) : with it vine and beer can be recycled to alcohol.
1.1 Alcohol will speed up healing, if it apply to any wound (will heal overtime(or disinfected), but slow, for those wounds, that heal themselves, but a bit faster.
1.2 Alcohol can be used in existing crafts like stitching patch.
2. Raw food: berries, shrooms, fruits, grub, roasted meat, drink water cause hhp damage - diarrhea\intoxication, berries have like 10% chance to dmg 1 hhp, and grub 100%
2.1 Absorbent carbon - boil coal(not a charcoal) with cloth(as filter), a lot of water. Cure diarrhea\intoxication instantly.
3. Hypothermia from snow biome and maybe from dig ball clay for a long time, time increased by will. Penalty agility и strength for each 10points of dmg.
3.1 Blueberry and alcohol - craft tincture - instant heal.
Also hot tea, but weaker.
4. Chance to get infected bite by animals with claws and fangs, will get worse overtime
4.1 Chance to get a broken/cracked bone by animals with Horns and hooves (that cause large debuff on strength).
4.2 Cure: poisoning - alcohol, cure: broken bone - bаndage (2 branches, string, clay)
5. Glimmermoss + toadstool brilliant hemostatic drug in reality
6. Panacea - something superhard to craft like need: silver nugget, pearl, glimmermoss, spring water, Ancient Root. Works as Ancient Root but more efficient like 50hhp min or 10% of all hhp dmg - much better for late game.
7. All debuff from trauma and cure make percentage effect, -8 agi for newbie is horrible, but later even -50 agi is less important. Better when debuff cause - 10% on stat from actual, with a certain minimum.
8. It will be nice, if you give me a hint of your thouths about system of diseases, which you mentioned some time ago. I can do some research and prepare some logic of it. In game can be found a lot of natural things, like berries and nuts, which never being used in recipes. Them can be a good candidates as ingredients in drugs for flu or other illness. I can help you with such things, like research and theory, got some practice in real natural medicine.