Swanson makes the same as Doctors Best. It is called "Novusetin" which is what is recommenced by researcher at Salk Institute "because she knows the source" is good. Also you might find is cheaper than Doctors Best

I have a pk.Dried Mullen it came no instructions it is Horrible to look at I put some in a mug boiling water .had to take leaves or whatever out first then drank it uhhh. i have bought mullen online a small bottle take2 drops that is nice but goes to quick and did not really feel any better maybe thats just me but i do think drinking . lime +sliced ginger tumeric.gives a lift.x

Mucinex twice a day works good for me. Told me to use exportant, not dm.

Fisetin is still the best I have found to help stop the phlegm I get almost immediately after eating something (eat, and sometimes drink almost anything causes phlegm). I get no noticeable side effects from Fisetin. I still use Swanson brand (Novusetin).100 mg immediately AFTER I eat a meal. Mucinex and other remedies may also help, but I find Fisetin works better for me. I still don't know if it is working through my electrical system, like the Vagus nerve because of its antioxidant action, or through its microbio blood system because of its anti-inflammatory action. In either case it appears to affect NFkappaB which is going after TNFalpha and IL-6 or 8 according to several studies around the world. For me it usually takes effect in only a few minutes after I take the pill and my coughing up phlegm is greatly reduced. I would like to hear about your experiences if you try it.

Mullein is very effective for coughing out mucus. You may try to make tea from dried leaves, or take mullein leaf drops https://www.amazon.com/USDA-Organic-Mullein-Dro.... It is also good with honey or lemon if you like.

Amazon.com: Mullein Drops for Lungs - USDA Organic Liquid - Mullein Leaf Extract Supplement - Made in USA - Lung & Bronchial Cleanse for Smokers - Respiratory Health Support - As Tincture, Tea, Pills - 4 fl oz : Health & Household

https://www.amazon.com/USDA-Organic-Mullein-Drops-Lungs/dp/B0CKBPTPRL