Half a million sharks could be slaughtered to obtain an ingredient used in coronavirus vaccines, conservationists have warned.Squalene, a natural oil made in the liver of sharks, is being used in some of the Covid-19 vaccines underway. The substance is currently used in medicine as an adjuvant – an ingredient that increases the effectiveness of vaccines by creating a stronger immune response.British drugs giant GlaxoSmithKline currently uses shark squalene in flu vaccines, and said it would manufacture a billion doses of the substance for potential use in covid jabs in May.It...…Half a million sharks could be slaughtered to obtain an ingredient used in coronavirus vaccines, conservationists have warned.Squalene, a natural oil made in the liver of sharks, is being used in some of the Covid-19 vaccines underway. The substance is currently used in medicine as an adjuvant – an ingredient that increases the effectiveness of vaccines by creating a stronger immune response.British drugs giant GlaxoSmithKline currently uses shark squalene in flu vaccines, and said it would manufacture a billion doses of the substance for potential use in covid jabs in May.It...WW…