 CARLSBAD, Calif., Sept. 20, 2021 PRNewswire -- Natural Alternatives International, Inc. NAI Nasdaq: NAII, a leading formulator, manufacturer and marketer of customized nutritional supplements, today announced net income of 3.0 million, or 0.47 per diluted share, on net sales of 44.4 million for the fourth quarter of fiscal year 2021 compared to net income of 1.8 million, or 0.27 per diluted share, in the fourth quarter of the prior fiscal year. 