T.W.
Monday 9th November 2009 2:49pm [Edited]
15,786 posts
Hhhmmm... Vitamin injections are generally a waste of everybody's time unless there are clear indications they have deficiencies. The causes of vitamin deficiencies are quite simple - 1) diseases which affect vitamin production/usage, 2) diseases/disorders which prevent absorption of vitamins from the gut 3) conditions affecting production of vitamins (e.g. lack of sunlight --> reduced vitamin D production --> reduced calcium uptake in the gut, and 4) polypharmacy (multiple prescribed drugs) which can lead to reduced production or vitamins...
The commonest form of injected vitamin is B12 (often together with folate/ferritin), used in diseases/conditions related to anaemias, where part of the problem becomes blood cell production due to insufficient uptake/use of vitamin B12.
Most other vitamins will be perfectly well absorbed by even a relatively healthy gut and so supplements are not usually necessary. The evidence for taking high dose vitamin C/E to help boost a person's immune system is hazy at best. Injection forms of these vitamins wouldn't be particularly useful (again) unless they had a gut disorder or were on certain meds which might be limiting GI absorption.
On the other hand, multi-vitamins tablets are unlikely to ever cause any harm. Some people swear by taking high dose (1000mg per day) vitamin C when they are feeling "run down", sometimes combined with vitamin E (which is related to the immune system)...
A persons immune system will generally be less "virile" as they age, but it will also be affected (to varying degrees) by chronic diseases/conditions which affect their everyday well-being. Most medications prescribed on a long-term basis shouldn't have a huge effect on the immune system. However, when a patient is on eight regular medications a set of blood tests at regular intervals is reasonably indicated to monitor the effects of the meds (and the diseases) on a person's blood count. A simple "full blood count" will usually identify any significant problems with a person's immune system.
I would also suggest that if someone if on multiple medications, the prescription should be reviewed fairly regularly by their GP/specialist with a view to making sure that they are all absolutely necessary. The other concern should always be is that one is not prescribing a new medication to treat a potential side-effect of another.