Adju-Phos is a range of aluminium phosphate gel products which have been specifically developed for use as an adjuvant in vaccines. The gel is a suspension of hydrated amorphous aluminium hydroxyphosphate nano/micron size crystals in loose aggregates. Adju-Phos products have a net negative charge at neutral pH and effectively adsorb positively charged antigens. The primary purpose of the adjuvant in vaccines is to boost the antibody-mediated (Th2) immune response. Adju-Phos products can be combined with other adjuvant types (such as monophosphoryl lipids) to achieve a balanced Th1/Th2 immune response.