Your search for "magnesium" revealed the following:

Sale price £27.53 Regular price £33.00 Sale
On Sale from £36.11 Regular price £50.00 Sale
Sale price £39.90 Regular price £50.00 Sale
Sale price £9.99 Regular price £20.00 Sale
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Sale price £144.95 Regular price £200.00 Sale
Sale price £56.59 Regular price £70.00 Sale
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Sale price £83.95 Regular price £90.00 Sale
On Sale from £36.38 Regular price £50.00 Sale
On Sale from £38.50 Regular price £70.00 Sale
Sale price £124.90 Regular price £150.00 Sale