MCMLXXIII said:
"Gymnema Sylvestre has its active component GS4, which raises the number of beta cells in the pancreas. Thus, the internal production of insulin (the amount of insulin produced by our body itself) is enhanced.However, G. sylvestre cannot be used in place of insulin to control blood sugar by people with either type 1 or type 2 diabetes".
Well now I'm confused.
To avoid confusion, you need to choose the sources that you rely on more carefully. The site that you have relied on is one of complimentary medicine which has taken a hypothesis which has yet to be confirmed and which has never been tested on human beings but which has nonetheless presented it as fact.
You are quoting what wiki says and the person who wrote that wiki page refers to this page as a source:
http://www.all-about-beating-diabetes.c ... betes.html
If you go to the home page of that site you will immediately see what that site is all about, selling books on lifestyle, natural remedies and diets.
http://www.all-about-beating-diabetes.com
Scientists have only ever done this research on rats and mice so that source cannot possibly make the claim that it does. You'll notice that it makes the claim but provides no evidence to support the claim. It does not provide any reference for the research, no scientific paper, no experiement. It's just a false conclusion based on anecdotal evidence. What is happening is that there is an improved insulin response but that is not because of a restoration of the beta cell function as claimed but because of the improved permeability within the cell wall.
The web site that you are quoting is based on a hypothesis which is over 20 years old. You see it being hypothesised in many papers, eg:
1990 Shanmugasundaram et al.
Use of Gymnema sylvestre leaf extract in the control of blood glucose in insulin-dependent diabetes mellitus
"GS4 therapy appears to enhance endogenous insulin, possibly by regeneration/ revitalisation of the residual beta cells in insulin-dependent diabetes mellitus."
or
1990 Baskaran et al.
Antidiabetic effect of a leaf extract from Gymnema sylvestre in non-insulin-dependent diabetes mellitus patients
"These data suggest that the beta cells may be regenerated/repaired in Type 2 diabetic patients on GS4 supplementation. This is supported by the appearance of raised insulin levels in the serum of patients after GS4 supplementation."
But what was actually going on was explained within the decade:
1999 Persaud et al.
Gymnema sylvestre stimulates insulin release in vitro by increased membrane permeability
"These results confirm the stimulatory effects of G. sylvestre on insulin release, but indicate that GS4 acts by increasing cell permeability, rather than by stimulating exocytosis by regulated pathways. Thus the suitability of GS4 as a potential novel treatment for NIDDM can not be assessed by direct measurements of beta-cell function in vitro."
which is what I quoted. No scientific paper has yet published any research which shows that consumption of this leaf extract restores the beta cell function. It does seem to improve insulin sensitivity but to say that it is a cure for the decline in the beta cell function is not demonstrated.