Chronic Fatigue Syndrome Support Group
Chronic Fatigue Syndrome (ME/CFS) describes a sense of exhaustion and post-exertion malaise, even when you have gotten enough rest and sleep. The disease is characterized by six months of incapacitating fatigue experienced as profound exhaustion and extremely poor stamina, and problems with concentration and short-term memory. The cause is unknown, but it is a...

I wouldn't bother. Our 'thing' hasn't been linked to any sort of vitamin/mineral deficiency.
When I lived in the city I ate fish or shellfish every day practically, so much so that my doctor was blown away by my 'good cholesterol' levels. He'd never seen the likes of it before. Shellfish is chock-a-block full of zinc, but it made no difference in my fatigue levels.
She has no medical or scientific training.
My advice is to move on...
I've been sick now for 15 yrs and I've been through many phases of desperation seeking and trying all different claims made by people who claim this and that made them better.
I'm still sick but my wallet is a lot lighter.