This treatment involves a naturally occurring substance that is found in certain nuts and seeds. Amygdalin is found in apricot kernels, cherry pits, some apple seeds, and a special type of almond seed called “bitter almond.” (Regular almonds do not contain amygdalin.) The bitter almond was the best source for amygdalin, but the USDA ordered all bitter almond trees to be destroyed, supposedly because of a concern about cyanide poisoning. (Amygdalin contains cyanide.)
^ Akhondzadeh, S.; Noroozian, M.; Mohammadi, M.; Ohadinia, S.; Jamshidi, A. H.; Khani, M. (2003). "Salvia officinalis extract in the treatment of patients with mild to moderate Alzheimer's disease: A double blind, randomized and placebo-controlled trial". Journal of Clinical Pharmacy and Therapeutics. 28 (1): 53–9. doi:10.1046/j.1365-2710.2003.00463.x. PMID 12605619.
In my opinion, when you find a certain therapy being criticized as being unproven quackery, then that is a pretty good sign that the alternative therapy is effective and safe. Big pharma would not waste their time preparing reports designed to warn people against using an alternative therapy unless that therapy is effective and has the potential for being a threat to their monopoly.
Thyme is a fragrant herb that makes a wonderful addition to your cooking, in part because it is rich in antioxidants. Thyme contains health-boosting flavonoids including apigenin, naringenin, luteolin, and thymonin, and has been shown to protect and increase the percentage of healthy fats found in cell membranes. As reported by the George Mateljan Foundation:12 "In particular, the amount of DHA (docosahexaenoic acid, an omega-3 fatty acid) in brain, kidney, and heart cell membranes was increased after dietary supplementation with thyme."
The simplest way to make natural cough syrup is to boil your herb (or herbs) of choice in water. The resulting liquid is now an herbal tea which can be strained and taken on its own. If you want to make a syrup, however, you'll need to let the strained tea cool just a bit and then add honey to the mixture. The amount of honey you add will vary depending on the amount of tea you have, but the resulting mixture should be thick enough to coat the throat.