London-listed Haleon, which was carved out as an independent company in July and comprises consumer health assets once owned by GSK GSK.L and Pfizer PFE.N, said its adjusted profit margin fell over the quarter mainly because of "cost inflation and incremental standalone costs". Adds details LONDON, May 3 (Reuters) - Haleon HLN.L, the world's biggest standalone consumer health business, on Wednesday reported first-quarter profit below analyst expectations. Organic revenue growth of 9.9% in the quarter was largely driven by price increases, but also a small rise in volumes.