Exhibit 5.2

December 2, 2014

Perrigo Company plc

Perrigo Finance plc

Treasury Building

Lower Grand Canal Street

Dublin 2, Ireland

Ladies and Gentlemen:

We are acting as counsel to Perrigo Company plc, a public limited company incorporated under the laws of Ireland (the “Parent Guarantor”), and Perrigo Finance plc, a public limited company incorporated under the laws of Ireland (the “Company”), in connection with the Registration Statement on Form S-3, as may be amended from time to time (the “Registration Statement”), under the Securities Act of 1933, as amended (the “Securities Act”), with respect to the Company’s issuance and sale of $500,000,000 principal amount of its 3.500% Senior Notes due 2021 (the “2021 notes”), $700,000,000 principal amount of its 3.900% Senior Notes due 2024 (the “2024 notes”) and $400,000,000 principal amount of its 4.900% Senior Notes due 2044 (together with the 2021 notes and the 2024 notes, the “Debt Securities”), to be issued under an indenture, dated as of December 2, 2014 (the “Base Indenture”), as supplemented by the first supplemental indenture, dated as of December 2, 2014 (the “First Supplemental Indenture” and, together with the Base Indenture, the “Indenture”), between the Company, the Parent Guarantor and Wells Fargo Bank, National Association, as trustee (in such capacity, the “Trustee”) and (ii) the related guarantees (the “Guarantees”) by the Parent Guarantor of the Company’s obligations under the Debt Securities pursuant to an Underwriting Agreement dated November 24, 2014 (the “Underwriting Agreement”), among the Company, the Parent Guarantor and J.P. Morgan Securities, LLC and Barclays Capital, Inc., as representatives of the several Underwriters named therein. With your permission, all assumptions and statements of reliance herein have been made without any independent investigation or verification on our part, and we express no opinion with respect to the subject matter or accuracy of such assumptions or items relied upon.

In connection with this opinion, we have (i) investigated such questions of law, (ii) examined originals or certified, conformed, facsimile, electronic, photostatic or reproduction copies of such agreements, instruments, documents and records of the Company and the Parent Guarantor, such certificates of public officials and such other documents, and (iii) received such information from officers and representatives of the Company and the Parent Guarantor as we have deemed necessary or appropriate for the purposes of this opinion. We have examined, among other documents, the following:

The documents referred to in items (a) through (d) above, inclusive, are referred to herein collectively as the “Documents.”

In all such examinations, we have assumed the legal capacity of all natural persons, the genuineness of all signatures, the authenticity of original and certified documents and the conformity to original or certified documents of all copies submitted to us as certified, conformed, facsimile, electronic, photostatic or reproduction copies. As to various questions of fact relevant to the opinions expressed herein, we have relied upon, and assume the accuracy of, statements, representations and warranties contained in the Underwriting Agreement and certificates and oral or written statements and other information of or from public officials, officers or other representatives of the Company, the Parent Guarantor and others, and assume compliance on the part of all parties to the Documents with their covenants and agreements contained therein.

To the extent it may be relevant to the opinions expressed herein, we have assumed that (i) the Debt Securities have been duly authenticated and delivered by the Trustee; (ii) all of the parties to the Documents are validly existing and in good standing under the laws of their respective jurisdictions of formation and have the power and authority to (a) execute and deliver the Documents, (b) perform their obligations thereunder and (c) consummate the transactions contemplated thereby; (iii) each of the Documents has been duly authorized, executed and delivered by all of the parties thereto (other than the execution and delivery of the Documents by the Company and the Parent Guarantor, to the extent execution and delivery is governed by New York law), the execution thereof does not violate the charter, the by-laws or any other organizational document of any such parties or the laws of the jurisdiction of formation of any such parties, and each of the Documents constitutes a valid and binding obligation of all the parties thereto (other than as expressly addressed in the opinions below as to the Company and the Parent Guarantor) enforceable against such parties in accordance with their respective terms; and (iv) all of the parties to the Documents will comply with all of their obligations under the Documents and all laws applicable thereto.

Based upon the foregoing and subject to the limitations, qualifications and assumptions set forth herein we are of the opinion that:

The opinions set forth above are subject to the following qualifications:

A. The opinions expressed herein are subject to the following: (i) bankruptcy, insolvency, moratorium, reorganization, fraudulent conveyance and other similar laws (or related judicial doctrines) now or hereafter in effect affecting creditors’ rights or remedies generally; (ii) general principles of equity (including, without limitation, standards of materiality, good faith, fair dealing and reasonableness, equitable defenses and limits as to the availability of equitable remedies) whether such principles are considered in a proceeding at law or in equity; and (iii) the application of any applicable fraudulent conveyance, fraudulent transfer, fraudulent obligation, or preferential transfer law or any law governing the distribution of assets of any person now or hereafter in effect affecting creditors’ rights and remedies generally;

B. We express no opinion as to the validity, binding effect or enforceability of any provision of any of the Documents

C. We express no opinion as to the effect of any law of any jurisdiction other than the State of New York wherein any party to the Documents may be located or wherein enforcement of any Documents may be sought that limits the rates or interest legally chargeable or collectible; and

D. We express no opinion as to any agreement, instrument or other document (including any agreement, instrument or other document referred to, or incorporated by reference in, the Documents) other than the Documents.

The opinions expressed herein are limited to the laws of the State of New York, each as currently in effect, and no opinion is expressed with respect to any other laws or any effect that such other laws may have on the opinions expressed herein. The opinions expressed herein are limited to the matters stated herein, and no opinion is implied or may be inferred beyond the matters expressly stated herein. This letter is given only as of the time of its delivery, and we undertake no responsibility to update or supplement this letter after its delivery.

We hereby consent to the filing of this opinion as an exhibit to the report on Form 8-K filed by the Company on the date hereof. In giving these consents, we do not hereby admit that we are in the category of persons whose consent is required under Section 7 of the Securities Act.