We use it mostly for our little one, who has infectious asthma. It saved her, even though she has a milk allergy from birth. Especially in cases of difficulty breathing, where oxygen constantly needed to be above 90 and never getting better... in the end, we didn't even need the oxygen if we gave her this supplement and the inhaler. Oxygen levels were above 98 only with the supplement, and her difficulty breathing disappeared. It saved many of us during the coronavirus, the liquid works magically. But... it's an expensive sport. Luckily, capsules also help. And the reishi plus does the job, but not in cases of difficulty breathing/oxygen for our little one, unfortunately, at least from what we tested because we didn't stop it.