Just came to my mind during a conversation in another post, and there could be something.
HCQ (C18H26ClN3O) have a close relative - quinine hydrochloride (C20H25ClN2O2), which have anti-malaria properties too. Structure of molecules are similar, so the properties should be similar to some extent too.
quinine hydrochloride molecule structure
Quinine is a component of tonics like Schweppes Bitter Lemon and many others. It is easy to check the presence of quinine in bitter tonic using UV lamp or LED. Quinine is fluorescent and tonic will glow under UV light. So, if HCQ cure covid (or make sympthoms less severe), tonic with quinin should too, may be with less efficiency.
So, the cure for covid could be literally in every grocery, gas station, supermarket, etc for a dollar right here, right now from the very beginning.
Not many people drink bitter tonics often, so the possible correlation between drinking tonic and severity of covid will be hard to notice. That could be a reason why all that FUD campaign against HCQ was heavily pushed by every MSM and authority shill. If HCQ would had been approved as a cure, very soon many will find out that you don't even need any medicine to cure that stupid flu, just a regular bitter drink from grocery.
This could put all that coronahoax to completely another level of maliciousness.
Didn't hear about quinin in grapefruits, however it have some similar substance - naringin, that reacts with our taste receptors in similar way. It also have two connected benzene rings (naphtalene ring), but have no nitrogen in ring. It is also fluorescent. I don't know what exact part of HCQ do the job, so it is hard to tell is it similar relative to the topic or not.
In any case grapefruit have huge amount of vitamin C which is definitely useful to fight the flu/cold.
Meanwhile, sunflower seeds have 5mg/100g Zn.