Indirect - since it doesn't impact the number of Path of exile currency health issues - a way to improve the nature's endurance is to increase its defensive parameters - i.e. protection, dodging and resistance to specific components. This will not increase the amount of health points, however you will lose less with each blow that is received.

You are able to to restore health:

Use potions - Hybrid Flask items and Life Flask permit you to restore a certain number of health issues.

Recover kills and points based on hits the Life on parameter permits you to restore a particular number of health points while Life on Kill restores health for every opponent that is killed. Return to the city - a visit to the town will restore health to its greatest.

Lighting mechanisms, or more precisely the assortment of light (Light Radius), is also associated with health points. The proportion of health points impacts the amount of cheap POE currency light generated - the lower it is, the weaker the light will be. This mechanics can be altered with the Arcane Vision ability .