I’ve been reading in other Covid long hauler groups that many people are doing vitamin tests to detect deficiencies. Has anyone done that, and if so, have you also done hair analysis or just blood or urine tests? And were you referred by your doctor or have you gone through a third party vendor? I prefer to do everything through my doctor, if possible, but also recognize my doctor may not find it helpful to do so may have to look at other options.

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