Colds
Echinacea is reported to have a beneficial effect on the immune system. It is said to help to both prevent colds as well as shorten the duration of a cold if taken at the first sign of symptoms. While it hasn't been substantially against colds, it has been proven to provide a boost to the immune system.
You increase the force of the impact
c
not as such, it is used as a preventative medicine, usually taken to prevent colds and similar ailments, it is suspected it may shorten if not prevent al together a cold or flu.
Contracture or contraction
Only if the tasks that are reduced in duration are on the critical path. Of course you can't arbitrarily reduce duration and what you do could increase costs e.g. doubling up on resources.
Antihistamines like diphenhydramine (Benadryl) may shorten the duration of the illness, but the illness will go away on its own.
You contact the regional office of the state Attorney General. As an alternative, and to shorten the time duration, a mediated agreement can be done and registered with the court.
Evidence shows that it is unlikely to prevent upper respiratory infections, but beginning a supplement promptly when symptoms occur can significantly shorten the duration of the illness.
you shorten it by etc.
You don't shorten 'it has'.
Vitamins can't shorten your height.