| http://www.w3.org/ns/prov#value | - And there are other herbs which work on the immune system, such as Echinacea, or Astragalus (not certain about those two and their continual use for dogs though) There is also another herb (which grows wild where I live in profusion! and is extremely cheap to buy) If this can not be bought easily where you live, I am sure it can be bought online, either in tincture form, or as a dried herb.
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