Thank you, Adam. Today, I'll review financial highlights of our first quarter 2024 results. For the quarter ended March 31, 2024, revenue totaled $1.27 million, an increase of $646,000 or 104% as compared to $620,000 for the quarter ended March 31, 2023. The increase in revenue was driven by sales growth in contract manufacturing of approximately 58% and consumer branded products of 178%.
Gross profit totaled $277,000 for the 3 months ended March 31, 2024, compared to a gross loss of $57,000 for the 3 months ended March 31, 2023. The increase of $334,000 in gross profit year-over-year was primarily due to the increase in consumer branded products.
Gross profit margin for the first quarter of 2024 was 21.9% compared to a negative gross margin for the first quarter of 2023 of 9.2%, and a gross profit margin of 14.6% in the fourth quarter of 2023.
Cost of revenues increased by $312,000 or 46.1% to $989,000 for the 3 months ended March 31, 2024, as compared to $677,000 for the 3 months ended March 31, 2023. The increase in cost of revenues is primarily aligned with the increase in revenue growth.
Selling, general and administrative expenses increased by $349,000 or 43.8% to $1.1 million for the 3 months ended March 31, 2024, as compared to $797,000 for the 3 months ended March 31, 2023. The increase in selling, general and administrative expenses is primarily attributable to an increase in advertising, marketing and Amazon fees, professional and consulting fees, end of compensation and benefits expense.
Research and development expenses decreased by $27,000 to $2,000 for the 3 months ended March 31, 2024, from $29,000 for the 3 months ended March 31, 2023. Net loss for the 3 months ended March 31, 2024, was $905,000 as compared to a net loss of $807,000 in the 3 months ended March 31, 2023.
As of March 31, 2024, the company had a cash balance of $2.4 million, which included an approximately $1 million registered direct offering led by insiders. As Adam explained earlier, there was a net usage of cash for investment in the first quarter of 2024 due to several nonrecurring key strategic investments and acquisition costs.
I would now like to open the call for questions. Operator?