Kona-based microalgae maker Cyanotech Corp. said it will increase its production of astaxanthin by 33 percent to keep pace with rising sales.

Demand for the dietary supplement shot up after it was promoted on a cable television program called the “Dr. Oz Show,.” the company said. The supplement also is the subject of a YouTube video.

“With our Astaxanthin sales almost doubling since January, we have ramped up production and are realizing record yields month after month,” said Brent Bailey, Cyanotech president and chief executive officer.

“In addition, we are adding 33 percent more astaxanthin capacity, which should be fully on line in six months,” Bailey said. “We want to be sure we have capacity to fill the needs of all our customers in a timely manner, and be sure that all the consumers who want to try this exceptional nutrient can get it.”

Cyanotech produces astaxanthin under the brand name BioAstin. Cynaotech also produces Hawaiian Spirulina Pacifica.

Cyanotech shares were up 5 cents at $3.94 in late trading on the Nasdaq Stock Market.