I can't take citrus either. I feel like I get worse headaches and float into my head again so called brainfog. I'm using the magnesium ascorbate and it it totally brilliant. I don't notice any bad side-effects, well apart from the mercury mobilization ones. So I try to stick with low doses even when C is known to protect the body from the mercury toxic effects. It hasn't got any thiols so it doesn't bind and excrete the mercury, only stirs things up in large doses.