Should i take advair 100/50 for mild/moderate asthma or should i try fix my lungs naturally? i'm afraid of some of the side effects i've read.

Asthma is Serious: You should follow the discretion of your doctor, especially if you trust him or her. There are absolutely no proven natural remedies for asthma.

Define "naturally": I agree there is no proven natural remedy if you're talking about herbal supplements, etc. Now, if you have allergic asthma, immunotherapy is shown to improve asthma control. This is a long-term process by which your immune system is changed with regular injections of allergen extract (also referred to as allergy shots). Some would consider that more natural.