**Exhibit 31.2****CERTIFICATION**I, Kevin McDonnell, certify that:I have reviewed this quarterly report on Form 10-Q of Leiner Health Products Inc.Based on my knowledge, this quarterly report does not contain any untrue statement of a materialfact or omit to state a material fact necessary to make the statements made, in light of thecircumstances under which such statements were made, not misleading with respect to the periodcovered by this report;Based on my knowledge, the financial statements, and other financial information included in thisquarterly report, fairly present in all material respects the financial condition, results ofoperations and cash flows of Leiner Health Products Inc as of, and for, the periods presented inthis report;Leiner Health Products Inc.’s other certifying officer and I are responsible for establishing andmaintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules13a-15(f) and 15d-15(f)) for Leiner Health Products Inc. and have:(a) Designed such disclosure controls and procedures, or caused such disclosure controls andprocedures to be designed under our supervision, to ensure that material information relating toLeiner Health Products Inc., including its consolidated subsidiaries, is made known to us byothers within those entities, particularly during the period in which this report is beingprepared;(b) Designed such internal control over financial reporting, or caused such internal control overfinancial reporting to be designed under our supervision, to provide reasonable assuranceregarding the reliability of financial reporting and the preparation of financial statements forexternal purposes in accordance with generally accepted accounting principles;(c) Evaluated the effectiveness of Leiner Health Products Inc.’s disclosure controls andprocedures and presented in this report our conclusions about the effectiveness of the disclosurecontrols and procedures, as of the end of the period covered by this quarterly report based onsuch evaluation; and(d) Disclosed in this report any change in Leiner Health Products Inc.’s internal control overfinancial reporting that occurred during Leiner Health Products Inc.’s most recent fiscal quarterthat has materially affected, or is reasonably likely to materially affect, Leiner Health ProductsInc.’s internal control over financial reporting; andLeiner Health Products Inc.’s other certifying officer and I have disclosed, based on our mostrecent evaluation of internal control over financial reporting, to Leiner Health Products Inc.’sauditors and the audit committee of Leiner Health Products Inc.’s board of directors (or personsperforming the equivalent functions):(a) All significant deficiencies and material weaknesses in the design or operation of internalcontrol over financial reporting which are reasonably likely to adversely affect Leiner HealthProducts Inc.’s ability to record, process, summarize and report financial information; and(b) Any fraud, whether or not material, that involves management or other employees who have asignificant role in Leiner Health Products Inc.’s internal controls over financial reporting.Date: August 14, 2007/s/ Kevin McDonnell