Natural Alternatives International, Inc. provided earnings guidance for the fiscal year ending June 30, 2021. Based on current sales order volumes and future period sales forecasts received from customers, the company now expect annualized fiscal 2021 net sales to increase between 45% and 55% compared to fiscal 2020. The company also expect to generate operating income between 7% and 9% of net sales for fiscal year ending June 30, 2021.