What allows health supplements to be anti-aging?

Helping your body. The 'supplements' only assist your body in helping it function better. Only you can help that along.
Antioxidant. Aging is a complex issue still not fully understood. But free radical damage is certainly part of the picture. Antioxidants help protect against free radical damage. Best to reduce exposure: oils high in polyunsaturated fat (soy, canola, corn, etc) produce toxic lipid peroxides when cooked with.. Avoid them. Cook with coconut oil.