How can a consumer effectively extend the *personal* shelf life of Vitamin C tablets beyond the manufacturer's official rating?

Answer

By subjectively accepting a higher percentage loss of potency.

A consumer can extend personal usability by adjusting their tolerance threshold; if the manufacturer sets the limit at 10% potency loss, accepting a 20% loss extends the functional life for that individual.

How can a consumer effectively extend the *personal* shelf life of Vitamin C tablets beyond the manufacturer's official rating?
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