Well … for me a combination has helped. Pacing of course, not over- or under -doing activity. Getting sunshine on my skin. Supplements I always take —. I always take magnesium before sleep. And then … EPA/DHA (Nordic naturals / proDHA Memory) to help w/brain fog. Glutathione. B vitamins. Methylcobalamin plus folate, anti-viral supplements, and more as my healthcare provider recommends. Supplements to support my adrenals. Clearing away any emotional stress as it arises or from the past. Making sure my gut is happy and healthy as we know a lot of immune system is in the gut.