Some hawthorn components produce marked sedative effects which indicate an action on the central nervous system. Further studies are urgently needed for a drug as potentially valuable as this one. Until additional research has been carried out, prospective users of hawthorn for heart and circulation problems should consider all the consequences. It is a very dangerous practice when such vital systems of the human body as the heart and blood vessels are involved. For this reason, self-treatment with hawthorn is neither advocated nor condoned.
Scientific studies seem to indicate that ginger has value as a preventive of motion sickness.
There are no reports of severe toxicity in humans from eating ginger, but some recent pharmacological studies seem to indicate that very large overdoses might carry the potential for causing depression of the central nervous system and cardiac arrhythmias. In the meantime, further investigations of these constituents and the therapeutic properties of ginger are warranted. Ginger appears to calm a stomach which is upset from motion sickness. Ginkgo biloba . It is extensively prescribed by physicians.