Exhibit 5.1

	LEWISRICE
314.444.7600 (direct) 314.241.6056 (fax) www.lewisrice.com	FINGERSH Attorneys at Law	600 Washington Avenue Suite 2500 St. Louis, Missouri 63101

June 18, 2014

Post Holdings, Inc.

2503 Hanley Road

St. Louis, Missouri 63144

Ladies and Gentlemen:

We have acted as special counsel to Post Holdings, Inc. a Missouri corporation (the “Company”), and the Company’s subsidiaries listed on Schedule I hereto (such subsidiaries, the “Delaware Subsidiaries”) in connection with the Registration Statement (File No. 333-193468) on Form S-4 filed by the Company, the Delaware Subsidiaries and certain other subsidiaries of the Company (collectively with the Delaware Subsidiaries, the “US Subsidiaries”), with the Securities and Exchange Commission (the “Commission”) under the Securities Act of 1933, as amended (the “Act”), relating to the offer by the Company and the US Subsidiaries (the “Exchange Offer”) to exchange up to $350,000,000 in aggregate principal amount of 7.375% Senior Notes due 2022 and related guarantees (collectively, the “Exchange Notes”) for $350,000,000 in aggregate principal amount of issued and outstanding 7.375% Senior Notes due 2022, and related guarantees, issued on July 18, 2013 (collectively, the “Original Notes”). The Original Notes were issued, and the Exchange Notes will be issued, under an Indenture, dated February 3, 2012 and supplemented on May 28, 2013, September 3, 2013, January 13, 2014, February 28, 2014 and April 18, 2014 (as so supplemented, the “Indenture”), among the Company, the subsidiary guarantors thereunder (including each of the US Subsidiaries) and Wells Fargo Bank, N.A., as trustee (the “Trustee”).

All capitalized terms which are defined in the Indenture shall have the same meanings when used herein, unless otherwise specified.

In connection with the opinions expressed below, we have examined: (i) the Registration Statement, including the prospectus and the exhibits (including those incorporated by reference) constituting a part of the Registration Statement; (ii) the Indenture and the Original Notes and the Guarantees thereof; and (iii) the forms of the Exchange Notes and the Notations of Guarantee of such Exchange Notes. We have also examined originals or copies, certified or otherwise identified to our satisfaction, of such other corporate records, agreements and instruments of the Company and the Delaware Subsidiaries, certificates of public officials and officers of the Company and the Delaware Subsidiaries, and such other documents, records and instruments, and we have made such legal and factual inquiries, as we have deemed necessary or appropriate as a basis for us to render the opinions hereinafter expressed. We have assumed the genuineness of all signatures, the legal competence and capacity of natural persons, the authenticity of documents submitted to us as originals and the conformity with authentic original documents of all documents submitted to us as copies. When relevant facts were not independently established, we have relied without independent investigation as to matters of fact upon statements of governmental officials and upon representations made in or pursuant to certificates and statements of appropriate representatives of the Company and/or the Delaware Subsidiaries.

Established 1909

LEWISRICE

FINGERSH

Post Holdings, Inc.

June 18, 2014

Page 2

In connection herewith, we have assumed that, other than with respect to the Company and the Delaware Subsidiaries, all of the documents referred to in this opinion have been duly authorized by, have been duly executed and delivered by, and constitute the valid, binding and enforceable obligations of, all of the parties thereto, all of the signatories to such documents have been duly authorized by all such parties and all such parties are duly organized and validly existing and have the power and authority (corporate or other) to execute, deliver and perform such documents.

Based upon the foregoing and in reliance thereon, and subject to the assumptions, comments, qualifications, limitations and exceptions set forth herein, we are of the opinion that, when (i) the Registration Statement has become effective under the Act, (ii) the Indenture has become duly qualified under the Trust Indenture Act of 1939, as amended, and (iii) the Exchange Notes (in the form examined by us) have been duly executed by the Company and authenticated and delivered by the Trustee and issued in exchange for the Original Notes in accordance with the provisions of the Indenture upon consummation of and otherwise in accordance with the Exchange Offer, (a) the Exchange Notes will constitute valid and binding obligations of the Company and (b) the Guarantee of each of the Delaware Subsidiaries provided for in the Indenture will constitute a valid and binding obligation of each such Delaware Subsidiary.

In addition to the assumptions, comments, qualifications, limitations and exceptions set forth above, the opinion set forth herein is further limited by, subject to and based upon the following assumptions, comments, qualifications, limitations and exceptions:

(a)The opinion set forth herein is made as of the date hereof and is subject to, and may be limited by, future changes in the factual matters set forth herein, and we undertake no duty to advise you of the same. The opinion expressed herein is based upon the law in effect (and published or otherwise generally available) on the date hereof, and we assume no obligation to revise or supplement this opinion should such law be changed by legislative action, judicial decision or otherwise.

(b)Our opinion contained herein may be limited by (i) applicable bankruptcy, insolvency, reorganization, receivership, moratorium or similar laws affecting or relating to the rights and remedies of creditors generally including, without limitation, laws relating to fraudulent transfers or conveyances, preferences and equitable subordination, (ii) general principles of equity (regardless of whether considered in a proceeding in equity or at law) and (iii) an implied covenant of good faith and fair dealing.

(c)Our opinion is further subject to the effect of generally applicable rules of law arising from statutes, judicial and administrative decisions, and the rules and regulations of governmental authorities that: (i) limit or affect the enforcement of provisions of a contract that purport to require waiver of the obligations of good faith, fair dealing, diligence and reasonableness; (ii) limit the availability of a remedy under certain circumstances where another remedy has been elected; (iii) limit the enforceability of provisions releasing, exculpating, or exempting a party from, or requiring indemnification of a party for, liability for its own action or inaction, to the extent the action or inaction involves negligence, recklessness, willful misconduct or unlawful conduct; (iv) may, where less than all of the contract may be unenforceable, limit the enforceability of the balance of the contract to circumstances in which the unenforceable portion is not an essential part of the agreed exchange; and (v) govern and afford judicial discretion regarding the determination of damages and entitlement to attorneys’ fees.

LEWISRICE

FINGERSH

Post Holdings, Inc.

June 18, 2014

Page 3

(d)We express no opinion as to the enforceability of (1) any provision of the Indenture purporting or attempting to (A) confer exclusive jurisdiction and/or venue upon certain courts or otherwise waive the defenses of forum non conveniens or improper venue, (B) confer subject matter jurisdiction on a court not having independent grounds therefor, (C) modify or waive the requirements for effective service of process for any action that may be brought, (D) waive the right of the Company or any other person to a trial by jury, (E) provide that remedies are cumulative or that decisions by a party are conclusive or (F) modify or waive the rights to notice, legal defenses, statutes of limitations or other benefits that cannot be waived under applicable law or (2) any provision of the Indenture relating to choice of law.

(e)We express no opinion as to whether a subsidiary may guarantee or otherwise be liable for indebtedness incurred by its parent except to the extent that such subsidiary may be determined to have benefited from the incurrence of the indebtedness by its parent or whether such benefit may be measured other than by the extent to which the proceeds of the indebtedness incurred by its parent are, directly or indirectly, made available to such subsidiary for its corporate or other analogous purposes.

We do not render any opinions except as set forth above. The opinion set forth herein is made as of the date hereof. We hereby consent to the filing of this opinion as an exhibit to the Registration Statement, and to the use of our name therein and in the related prospectus under the captions “Legal Matters.” We also consent to your filing copies of this opinion as an exhibit to the Registration Statement with agencies of such states as you deem necessary in the course of complying with the laws of such states regarding the Exchange Offer. In giving such consent, we do not thereby concede that we are within the category of persons whose consent is required under Section 7 of the Act or the Rules and Regulations of the Commission thereunder.

Very truly yours,

LEWIS, RICE & FINGERSH, L.C.

/s/ Lewis, Rice & Fingersh, L.C.

LEWISRICE

FINGERSH

Post Holdings, Inc.

June 18, 2014

Page 4

SCHEDULE I

Delaware Subsidiaries

NAME	JURISDICTION	ENTITY TYPE
Agricore United Holdings Inc.	Delaware	Corporation
Attune Foods, LLC	Delaware	Limited liability company
Custom Nutriceutical Laboratories, LLC	Delaware	Limited liability company
Dymatize Enterprises, LLC	Delaware	Limited liability company
Dymatize Holdings, LLC	Delaware	Limited liability company
Golden Acquisition Sub, LLC	Delaware	Limited liability company
Golden Boy Nut Corporation	Delaware	Corporation
Golden Boy Portales, LLC	Delaware	Limited liability company
Post Foods, LLC	Delaware	Limited liability company
Premier Nutrition Corporation	Delaware	Corporation
Supreme Protein, LLC	Delaware	Limited liability company
TA/DEI-A Acquisition Corp.	Delaware	Corporation
TA/DEI-B1 Acquisition Corp.	Delaware	Corporation
TA/DEI-B2 Acquisition Corp.	Delaware	Corporation
TA/DEI-B3 Acquisition Corp.	Delaware	Corporation