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I didn't note any side effects, but only tried a few doses.
I did try some pine needle tea today, which tasted better than I assumed it would.

I heard orange peels works as a tea too. You could probably try regular dosing with herbal tea containing citrus peel.

I felt something coming on yesterday. Took quercetin over two days and now I am right as rain.

Yeah I tried some quercetin as well. It's hard to tell exactly what worked, but when something was coming on it got fixed up really quickly. Coulda been delta variant for all I know, or just a common virus, but it's gone now. I wish I had known about vitamin C, D, Zinc, quercetin, oregano oil, colloidal silver, and a few other natural remedies years ago.

I have used zinc and C for ages but yeah quercetin is a game changer; that a low carb diet.

Oh yeah? Been a few years since I did low carb. Nowadays I stay fairly fit being vegan and gluten-free, so haven't had to be low carb. I should definitely try a week or two, though, see if that makes any noticeable difference. Another thing I was thinking about is either intermittent fasting, or an elimination diet to look for allergies/sensitivities.

Haha ... I am pretty much carnivore other than a little berries, coffee, and mushrooms. A little bit of squash here and there. I pretty much eat the opposite of what corporations tell me to. I did my vegan days decades ago in university when I was studying dietetics. I did not find it delivered on much. Lots of brain fog, though. It really did not deliver anything resembling the heath and fitness I enjoy now.

Yes, intermittent fasting is good. But absolutely, the insulin response must be controlled for optimal health to control inflammation and glycation.

I notice some pretty massive corporations pushing meat consumption, as well as the almighty coffee bean, so you're not exactly the opposite of a corporate diet :P
I think it's my insulin response that needs taming (to control inflammation), yes. I'm not overweight, and very low triglycerides, but possibly doing some damage with insulin spikes from rice, potatoes, pancakes, pasta. My hba1c was a little elevated in the past, but hasn't been checked recently. I don't trust mainstream medicine anymore, unfortunately. Caught it lying to me too many times.