In A Nutshell Aloe Vera Author:Jill Rosemary Davies As a general healer and immune system booster, aloe vera is an incredibly adaptable herb. Appropriate for both internal and external use, from minor scrapes to Parkinson's Disease, aloe is a safe, natural healer. In A Nutshell--Healing Herbs: Aloe Vera thoroughly explores the herb in an authoritative, yet accessible, manner.