Thank you, Adam. Today, I'll review financial highlights of our first quarter 2023 results. For the first quarter of 2023, as Adam mentioned, revenue was $620,000 compared to $396,000 in the first quarter of 2022. This 57% year-over-year growth was primarily due to sales growth in both our contract manufacturing and branded products.
During the first quarter, we saw our sales mix return to more normalized levels following the aforementioned issues we experienced in Amazon that Adam discussed earlier. As a result, we expect branded product revenue to remain closer to 50% of total sales, with the remaining 50% split between the other lines of business. In the first quarter of 2023, branded product revenue was 51.6% versus 44.4% for contract manufacturing revenue.
Gross loss for the first quarter of 2023 was $57,000 compared to $22,000 for the same period in 2022. Gross margin loss for the first quarter of 2023 was 9.2% compared to a gross margin loss of 5.6% for the first quarter of 2022. The increase in the loss was mainly due to the increased manufacturing of promotional materials and customer product samples to support our new product line growth.
Based on our projected revenue growth for Q2 2023, we expect significantly improved gross margins. Cost of revenues was $677,000 for the quarter ended March 31, 2023, an increase of 62% compared to $418,000 for the quarter ended March 31, 2022.
Total operating expenses, including R&D and SG&A expenses, increased $826,000 for the 3 months ended March 31, 2023, compared to $790,000 for the prior year period. The year-over-year increase was primarily attributable to the factors I described earlier, including higher expenses related to new product line growth. Other factors included increased Amazon selling fees as well as an increase in advertising and marketing. This was partially offset by lower investor and shareholder services expenses due to the initial fees we incurred in 2022 related to our NASDAQ listing.
Research and development expenses increased slightly by $5,000 to $29,000 for the 3 months ended March 31, 2023, from $24,000 for the 3 months ended March 31, 2022.
Net loss for the quarter ended March 31, 2023, improved to $815,000 or $0.15 per basic and diluted share compared to a net loss of $1.8 million or $0.33 per basic and diluted share for the prior year period.
As of March 31, 2023, NEXGEL consolidated had approximately $5.8 million of cash and cash equivalents and marketable securities, which includes an investment in treasuries of $5 million. As of March 31, 2023, NEXGEL had 5,614,028 shares of common stock outstanding.
I will now open the call for questions. Operator?