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Alhydrogel ® is a sterilized aluminum hydroxide wet gel suspension which has been autoclaved in bulk and aseptically filled under LAF. It tolerates re-autoclavation, but is destroyed if frozen.

When the pH is maintained at 6-8, which is normal during vaccine production, Alhydrogel ® has a positive charge so they readily adsorb negatively charged antigens (e.g. proteins with acidic isoelectric points at neutral pH).

Alhydrogel ® is available in three varieties: Alhydrogel ® 1.3%; Alhydrogel ® 2% and Alhydrogel “85″.