Physiol Rev 90 , 859904 (2010)
It depends on the patients health and the doctors advice
ADVERSE EFFECTS AND WARNING: Related to vitamin B6: possibility of sensory neuropathy and it is reversible after the stop of the treatment, which is noted for patients on high dose and/or long-term treatment
[25] A human prospective cohort study conducted on a sample of 266 people over age 60 demonstrated that treatment with epithalamin, the pineal gland extract upon which epitalon is based, produced a 1 } : CS1 maint: deprecated archival service (link) al
And indeed those fall under this category, but there are a bunch of other tissues for which you may want to improve metabolism and perhaps growth as well
Interstitial Cystitis (IC) (aka Painful Bladder Syndrome) is a condition in which patients experience bladder pressure, discomfort or pain that can be associated with frequent and urgent urination and a burning sensation during bladder emptying