This is a single-arm, open-label, 8-week "proof of concept" pilot study in 20 subjects to determine if there are detectable lipid-lowering effects of oyster mushrooms in patients with HIV and hyperlipidemia who are taking Kaletra (a ritonavir-containing HAART regimen). The study will also assess whether the concurrent administration of oyster mushrooms and such regimens is safe, and investigate the mechanism of action whereby oyster mushrooms may exert their antihyperlipidemic effect.