other OTC drugs which might be helpful boosting the immune system are
Quercetin 500mg 2x daily
Luteolin 50mg 2x daily
But Zinc seems to be very helpful
Funny, I've been debating posting a thread or something about what to take/not take. My main issue with doing so is every one will clammer-on about whatever fits their desires, not really what I'd consider substantiated. However things I would consider substantiated would surely be consider not at the same time because people like to believe what they want.
Quercetin is a great thing to take. You're fine taking 500mg a day unless you have onset. It's also not a drug and should be purchased at a healthfood/vitamin store. It's been shown to be very good against common viral infections (peer-reviewed published). It has other benefits of more common association like cardiovascular/joint. It's found in food, such as green tea.
I'm not sure
Luteolin would help a lot with symptoms, but probably for recovery. For symptoms would could consider
Bromelain as it's one of the more powerful anti-inflammatoriess out there.
Mucinex should be considered, especially if you can find a liquid form. Even if the cv19 doesn't make you produce mucus, considerable amounts of people have the side effect of other infections that do.
*You can eat more onion and drink chamomile tea to get more Quercetin and Luteolin in diet.
A word on
Zinc. Don't start taking now in large amounts. Getting it from healthy food or in minor amounts from supplements is better until onset. It actually depresses the immune system when you take it all willy-nilly in high doses for no reason.
Vitamin A & D should be avoided upon onset of symptoms. Minor amounts of either are ok, but the higher dosages we take have shown to make us more receptive to the virus. Up until onset it's wise to take Vitamin D to get the immune system in good shape (Vitamin A I think is often better achieved through foods, retinol from dairy, eggs, meat, and beta types from veggies.
Vitamin B1 won't register on anyone's hotlist, but it is very valuable when the body is trying to recover from anything traumatic. It can help some with immediate issues, but varies on the person. It's great for getting past fatigue and other continual lingering problems. It helps the body energize back up off of the nutrients you're taking in. Here's the part that sucks a bit, the common type Thiamin HCL doesn't do anything really till you're taking at least 300mg - you're best off taking more like 800mg+ at a time, which is a handful of 100mg pills. But there is the benfotiamine form which is more effective and could be taken at servings like 300mg. Then there's Allithiamine (TTFD: thiamine tetrahydrofurfuryl disulfide) which is effect on the brain at common dosages of 50mg, but taking 100mg would still be better. It can do surprising things for dragging people out of slumps. It can even open up digestive tracts that are clamped down hard (constipation).
Larch fiber (Arabinogalactan) is one of the best immune system simulator and regulators for our intestines (which is where the immune system starts). This is advisable to take before, during, and after. Along with it a
Probiotic would be recommended to really get it perked up properly - from healthfood/supplement store, anything is going to be useful.
Elderberry syrup is outright amazing. The supplements with tiny servings in them don't do a lot. If you can find a syrup where you're getting grams at a time, I'd be taking swigs off the bottle on the onset of symptoms. It's so powerful that it can clear symptoms out entirely in one shot for the day with known ailments (unknown for powerful it is on cv19). They are likely to come back overnight because the immune system still has to do it's job, but not having symptoms can be life saving - or at least very comfortable by comparison. I will say this though, I ordered some WEEKS AGO and have yet to receive it. Everyone is probably SOL on this.
There's lots of other things I could say about food etc but that's harder to get into.