I *loved* this vid. The part where he discusses Meth as a cure for COVID is *so* injun. Straight out of the Cahokia playbook?
The flu and common cold were rebranded as Covid. (Adverse reactions to the vaccines are likewise branded as symptoms of Covid infection.) Since I prefer to deal with real-world things, I will assume that by "Covid" you are referring to the common cold and flu. Since we are dealing with ordinary colds and flus here, let's refer to them by their ordinary names. I prefer to deal with real-world things. I am not interested in talking about hoaxes any more. Covid was a hoax. Let's leave that behind us now. Let idiots believe what they want to believe. They don't matter.
Now that the above disclaimer is out of the way, a few remarks are in order regarding your supposed "cure" for "Covid" (which I will take to mean "common cold and flu").
You can reduce the main symptom of the common cold (excessive mucus production) with over-the-counter cough medicines such as Sudafed because the active ingredient in these medicines is ephedrrine/pseudoephedrine, which is a form of amphetamine (derived from the plant ephedra).
Methamphetamine is well-nigh identical to ephedrine. A slight difference in chemical structure allows methamphetamine to cross the blood-brain barrier much more effectively than ephedrine. These drugs have similar bodily effects, but methamphetmine (and dextroamphetmine) have an additional mental effect, which ephedrine also has to some extent, but only to a very slight degree; likewise, methamphetaine has the same bodily effects as ephedrine (increased heart rate, etc), but to much slighter degree than ephedrine.
Both ephedrine and methamphetamine trigger the release of the same stress hormones which causes the small blood vessels in the nose to become narrower, reducing the thickness of the lining of the nose and thinning the secretion of mucus.
But this is not a 'cure' to the common cold! It just suppresses the main symptom (increased mucus production). But this 'symptom' is very good for you. If you eliminate the symptoms you are robbing yourself of the benefits of having a cold. For the cold is nothing more than a seasonal detoxification process that the body goes through on a regular basis, due to the accumulation of toxins and damaged cells whic have to be periodically got rid of to restore our health. The toxins are from a myriad of sources: pollutants in the air we breathe, the toxic food that everyone eats on a daily basis (cooking itself produces toxins that the body has to periodically flush out of its system); also contaminated water (fluoride and chlorine being the most common culprits), alcohol, cigarettes, vaccines, prescription drugs, toxic work environments, etc.
Cold detoxification cleanses the respiratory system, connected lymphatic glands and nodes, and brain. Bacteria stir from hibernation to consume damaged, decaying and dead cells. That is the natural function of bacteria and fungi in the human body. After they complete their natural function of consuming degenerated organic matter, our bodies enter an intense healing cycle, usually indicated by fever. When that is complete, our bodies have finished a cycle of improvements. Let colds run their course by supplying nutrients that best facilitates cleansing and healing.
So I strongly recommend that people don't take this 'cure'. Ephedrine/pseudoephedrine and methamphetine do get rid of the cold - or rather they suppress the most annoying symptom of the cold - but all you are doing is harming your body and depriving yourself of the benefits of a cold. Fun fact: there are people who almost never get colds and flus, and their life expectancy is much lower as compared with people who get them on a regular basis. They tend to die in their 30s and 40s on average. And people who have more colds and flus than the average tend to live a few years longer. Their body is better at detoxifying itself in general, and the respiratory system in particular. That's why they get 'sick'. Avoiding sicknesses of this kind is avoiding necessary healing.