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The beta sitosterol and quercetin has been produced exclusively for the Prostate Help Association by Lifeplan Products Ltd. an ISO 9000 company. Lifeplan are also accredited by the MHRA( Medicines and Healthcare Products Regulatory Agency ), so all their products are produced to medical standards. Each step of the manufacture from selection of the beta-sitosterol/quercetin, to its final encapsulation, is monitored and checked for purity and quality.
Our products comply with all UK regulations regarding irradiation, GMO, contaminants and allergens.
Much beta-sitosterol on the market is not of very good quality or purity. For instance some is irradiated to kill infestation and to improve its shelf life. This is done because the product was processed in unhygenic conditions and would have had bacteria present.
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Beta Sitosterol.
U.K. /E.U. customers please shop here. 
Quercetin.
This plant extract is not recommended for anyone who has had an organ or bone marrow transplant, as it can reverse an immune suppressor.
Diabetics may need to monitor blood insulin levels under medical supervision as this plant extract can reduce insulin requirements.
We recommend starting with three capsules per day, lowering the amount as your condition improves.
Before you use any product or treatment your first move should be a visit to your GP/MD to have an accurate diagnosis of your problem. Otherwise at best you could be wasting your money, at worst you could be doing yourself harm by neglecting a potentionally serious problem.