evidence: Scientists add some bizarre things to vaccines, such as aluminium and extracts from shark livers. Many vaccines simply don’t work without them – but no one knows why. [...] First up, though the concept of additives in vaccines might sound alarming, they’re included in microscopic quantities. There is as little as 0.2mg of aluminium in a typical vaccine dose, which is equivalent to less than the weight of a single poppy seed. The weight of evidence is that adjuvants do not lead to serious side-effects. [...] To this day, the aluminium in vaccines is always in the form of salts. These include aluminium hydroxide (commonly used as an antacid to relieve indigestion and heartburn), aluminium phosphate (often used in dental cement) and potassium aluminium sulphate, which is sometimes found in baking powder.