EXHIBIT 24.1

                   NUVEEN COMMODITIES INCOME AND GROWTH FUND
                NUVEEN COMMODITIES INCOME AND GROWTH MASTER FUND

                               POWER OF ATTORNEY

KNOW ALL MEN BY THESE PRESENTS, that the undersigned, a trustee of the above-
referenced organizations, hereby constitutes and appoints ALAN G. BERKSHIRE,
GIFFORD R. ZIMMERMAN, JESSICA R. DROEGER, LARRY W. MARTIN and WALTER M. KELLY,
and each of them (with full power to each of them to act alone) his true and
lawful attorney-in-fact and agent, for him on his behalf and in Registration
Statements on Form S-1 under the Securities Act of 1933, including any amendment
or amendments thereto, with all exhibits, and any and all other documents
required to be filed with any regulatory authority, federal or state, relating
to the registration thereof, or the issuance of shares thereof, without
limitation, granting unto said attorneys, and each of them, full power and
authority to do and perform each and every act and thing requisite and necessary
to be done in and about the premises in order to effectuate the same as fully to
all intents and purposes as he might or could do if personally present, hereby
ratifying and confirming all that said attorneys-in-fact and agents, or any of
them, may lawfully do or cause to be done by virtue hereof.

IN WITNESS WHEREOF, the undersigned trustee of the above-referenced
organizations has hereunto set his hand this 6th day of December, 2005.

                                                  /s/ John P. Amboian
                                                  ------------------------------
                                                  John P. Amboian

STATE OF ILLINOIS  )
                   ) SS
COUNTY OF COOK     )

On this 6th day of December, 2005, personally appeared before me, a Notary
Public in and for said County and State, the person named above who is known to
me to be the person whose name and signature is affixed to the foregoing Power
of Attorney and who acknowledged the same to be his voluntary act and deed for
the intent and purposes therein set forth.

"OFFICIAL SEAL"                                   /s/ Jose A. Visaya
Jose A. Visaya                                    ------------------------------
Notary Public, State of Illinois                  Notary Public
My Commission Expires: 05/15/2009