Leiner Health Products 10-Q 2007 Q1 Quarterly report

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 material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

Based on my knowledge, the financial statements, and other financial information included in this quarterly report, fairly present in all material respects the financial condition, results of operations and cash flows of Leiner Health Products Inc as of, and for, the periods presented in this report;

Leiner Health Products Inc.’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-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 and procedures to be designed under our supervision, to ensure that material information relating to Leiner Health Products Inc., including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c)  Evaluated the effectiveness of Leiner Health Products Inc.’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this quarterly report based on such evaluation; and

(d)  Disclosed in this report any change in Leiner Health Products Inc.’s internal control over financial reporting that occurred during Leiner Health Products Inc.’s most recent fiscal quarter that has materially affected, or is reasonably likely to materially affect, Leiner Health Products Inc.’s internal control over financial reporting; and

Leiner Health Products Inc.’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to Leiner Health Products Inc.’s auditors and the audit committee of Leiner Health Products Inc.’s board of directors (or persons performing the equivalent functions):

(a)  All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect Leiner Health Products 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 a significant role in Leiner Health Products Inc.’s internal controls over financial reporting.

Date: August 8, 2006

/s/ Kevin McDonnell

Kevin McDonnell

Executive Vice President and Chief Financial Officer