Colloidal Silver Is a Mineral Supplement, which for generations has been used in alternative medicines in both animals and Humans alike. It is claimed in Chickens to be more effective than many leading Products,at a fraction of the cost. We sell 25 ppm (parts per million) in 100 ml sizes for £13. The RRP on this product is £19.99. This Item is available for collection or at a postage rate of £4 For Larger Amounts Contact Us For More Info We are able to accept Paypal.Please contact us for further in formation.