Matthew T. Farrell
President and Chief Executive Officer at Church & Dwight
Good morning, everyone. Thanks for joining us today. I'll begin with a review of the Q1 results. And then I'll turn the call over to Rick Dierker, our CFO. And when Rick is done, we'll open the call up for questions. Q1 was another solid quarter for Church & Dwight. Reported sales growth was 5.1%, beating our outlook of 4%, thanks to stronger results across the board from domestic, international and specialty products. Organic sales grew 5.2%, which exceeded our 4% Q1 outlook with volume accounting for a very healthy 70% of our growth. Gross margin expanded 220 basis points. At the same time, we increased marketing spending in the quarter and gained market share in the majority of our categories. Adjusted EPS was $0.96, which was $0.11 higher than our $0.85 outlook. The results were driven by higher-than-expected sales growth, gross margin expansion and a lower tax rate.
We continue to grow in the online class of trade with online sales as a percentage of global sales now reaching 20.5%. In March, we signed a definitive agreement to acquire GRAPHICO, our Japanese distributor for approximately $35 million. We expect the acquisition to close later this year. GRAPHICO's annual sales are approximately $38 million. The business is based in Tokyo and has 59 employees. Since 2008, GRAPHICO has partnered with Church & Dwight and driven OXICLEAN to be the number one powder prewash additive in Japan. The acquisition is expected to contribute to greater expansion of our business in Japan and the greater APAC region. We intend to leverage the capabilities of the GRAPHICO team to bring additional Church & Dwight brands to Japanese consumers. Now I'm going to turn my comments to each of the three businesses.
First up is the U.S. The U.S. consumer business had 4.3% organic sales growth, 3.3% that was volume driven, making this the third consecutive quarter of U.S. volume growth. five of our seven power brands gained market share in the quarter and private label market share in our categories remained relatively stable. Now let's look at a few important categories in the U.S., starting with laundry. ARM & HAMMER liquid laundry detergent consumption was flat while the category grew 2%. Many of you may recall, we had pulled back on promotional activity in Q4, and that continued into early Q1. As our promotional activity normalized, ARM & HAMMER liquid laundry saw share gains late in the quarter and the brand has continued to perform well in April. Now elsewhere in laundry, ARM & HAMMER unit dose and ARM & HAMMER scent boosters both grew faster than their categories and grew share in the quarter.
Our XTRA liquid laundry brand, which is our extreme value offering grew consumption 6.3% and increased market share to 3.8%. Regarding new products, we have launched two new products into the detergent category, ARM & HAMMER Deep Clean and ARM & HAMMER Power Sheets. The first ARM & HAMMER Deep Clean is our most premium ARM & HAMMER laundry detergent entering the mid-tier of liquid laundry and delivering a superior clean at a price consumers can afford. The second new product is ARM & HAMMER Power Sheets laundry detergent, which is launched -- which was launched online in August of 2023. ARM & HAMMER was the first major brand to offer this new unit dose form in the U.S. Now due to its online success, Power Sheets is now available in select brick-and-mortar retailers. Power Sheets continues to grow online.
It now has 9,000 reviews with a 4.5 rating, and both Deep Clean and Power Sheets are off to a great start in 2024, and we're excited about the early results we are seeing. Now over in Litter. ARM & HAMMER Litter grew consumption 5% in Q1, which was in line with category growth. Our new lightweight ARM & HAMMER Hardball Clumping Litter is now expanding nationally after a successful in-market test in 2023. We expect this new litter to help ARM & HAMMER capture a greater share of the lightweight litter category. To give you a couple of facts here, lightweight litter today accounts for 16% of the clumping litter category. Our share of lightweight clumping litter has grown from 4% to 6% since year-end 2023, but that compares to our 29% share in regular weight litter. So still a long way to go. Turning to Personal Care, BATISTE continues to see strong consumption growth with consumption up 19% in Q1, growing share to 47.5%.
BATISTE continues to be the global leader in dry shampoo. We are meeting consumers' desire for long-lasting results with the launch of BATISTE Sweat Activated and BATISTE Touch Activated dry shampoos. And so far, consumers are posting excellent reviews for both of these new innovations. Now our mouthwash. THERABREATH mouthwash and HERO continue to perform extremely well. THERABREATH is the number one alcohol-free mouthwash brand and is now the number three brand in total mouthwash with a 16% share. THERABREATH recently entered the antiseptic segment of the category with the launch of TheraBreath Deep Clean Oral Rinse, which represents 30% of the category. HERO continues to drive the majority of growth in the acne category and has grown to become the number one brand in the larger acne category with 19% share.
HERO continues to launch innovative solutions in patches combined with adjacent consumer needs, such as recently launched Dissolve Away Daily Cleansing Balm. Now there are two businesses, Gummy Vitamins and WATERPIK that created a drag on total company organic growth in Q1. First, WATERPIK. The good news for WATERPIK is consumption for our water flosser business is healthy. However, flosser shipments were affected by retailer inventory adjustments in the first quarter. This, combined with lower shower head consumption accounted for a 1% negative drag on organic revenue growth but we expect this to be transient. The second is gummies, which also created a 1% drag. The Gummy Vitamin category declined 5% in Q1, which was actually worse than our expectations for the category and our consumption was down even greater, down 12%.
We continue to move forward with our plans to stabilize our vitamin business through changes, through packaging, messaging and greater marketing investments that we've talked about with you in the past. I will close my comments on the U.S. by saying that overcoming the drag from these businesses still -- and still posting a 5% organic sales growth for total company, just illuminates the strength of our portfolio. Turning now to international and Specialty Products. Our international business delivered organic growth of 8.8% in Q1. This was driven by strong growth in the subsidiaries, just a few callouts, especially Mexico, Germany, U.K. and France. And also had growth from our Global Markets Group.
And finally, Specialty Products. Specialty Products organic sales increased 7.2% primarily due to record sales in our Eurasia business as SPD continues to expand globally. I want to wrap up my remarks by reiterating that the company is performing well with all three divisions delivering strong growth. And I want to thank our global employees for their great efforts each and every day. Now we rarely raise our full year outlook after only one quarter. But given our fast start, we raised our outlook for gross margin and EPS growth, and we have confidence in our new full year forecast.
And now I'm going to turn it over to Rick to give you some more color around the quarter.