Pfizer, the world’s biggest drug company, flopped miserably with a seemingly can’t-miss idea. But Alfred E. Mann is so certain he can succeed that he is betting nearly $1 billion of his own money on the effort.

Pfizer’s failure was a form of insulin that people with diabetes could inhale rather than inject. But last month, after selling only $12 million worth of inhaled insulin in the first nine months of the year, Pfizer said it would take a $2.8 billion charge and abandon the product.

Mr. Mann, the 82-year-old chief executive and controlling shareholder of the MannKind Corporation, is not deterred. He says his company’s inhalable insulin is not just a way to avoid needles but is medically superior to Pfizer’s product and to injected insulin.

If he is right, he could help change the way diabetes is treated.

“I believe this is one of the most valuable products in history in the drug industry, and I’m willing to back it up with my estate,” Mr. Mann said at his 23,000-square-foot mansion overlooking the San Fernando Valley. The interview took place on a Saturday evening, which Mr. Mann said was the only opening in his seven-day work schedule.

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