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 £4.50 For Larger Amounts Contact Us For More Info We are able to accept Paypal. Please contact us for further in formation.