Nattokinase has science behind its use with covid. Natural supplements including micronutrients (vitamin C, vitamin D; zinc, NAD), probiotics, antioxidants (NAC), as well as melatonin are used in naturopathic medicine to combat covid damage. Black seed extract, green tea and Irish Sea moss do have anti-inflammatory properties, but the studies of these substances regarding covid are to their use in the prevention of catching covid or reducing the symptoms in an affected person. There is a potential connection with low selenium levels and catching covid or having a more severe case of covid, so the thought there is to increase selenium levels to reduce the chance of catching it and reduce the severity of the illness. I agree with Beau that the magnesium stearate and silicon dioxide are problematic.
I completely understand your concern with the cost of all these supplements we should take, and the inconvenience of having to take so many. I keep having to buy a bigger and bigger pill dispenser to accommodate all my supplements.
Unfortunately, piecemeal seems to be the best way to get them into our bodies. I will research some combined supplements to see if I can find any that could be combined to reduce the number recommended and let everyone know what I find. If anyone knows of any, it would be great if they could share.