<SEC-DOCUMENT>0001341004-17-000544.txt : 20170830
<SEC-HEADER>0001341004-17-000544.hdr.sgml : 20170830
<ACCEPTANCE-DATETIME>20170830160602
ACCESSION NUMBER:		0001341004-17-000544
CONFORMED SUBMISSION TYPE:	497
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20170830
DATE AS OF CHANGE:		20170830
EFFECTIVENESS DATE:		20170830

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			BlackRock Health Sciences Trust
		CENTRAL INDEX KEY:			0001314966
		IRS NUMBER:				000000000
		STATE OF INCORPORATION:			DE

	FILING VALUES:
		FORM TYPE:		497
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	333-210770
		FILM NUMBER:		171060751

	BUSINESS ADDRESS:	
		STREET 1:		100 BELLEVUE PARKWAY
		CITY:			WILMINGTON
		STATE:			DE
		ZIP:			19809
		BUSINESS PHONE:		(888) 825-2257

	MAIL ADDRESS:	
		STREET 1:		100 BELLEVUE PARKWAY
		CITY:			WILMINGTON
		STATE:			DE
		ZIP:			19809
</SEC-HEADER>
<DOCUMENT>
<TYPE>497
<SEQUENCE>1
<FILENAME>form497.htm
<DESCRIPTION>FORM 497 FOR BLACKROCK HEALTH SCIENCES TRUST
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<div style="FONT-SIZE: 12pt; FONT-FAMILY: 'Times New Roman', serif; TEXT-ALIGN: right; LINE-HEIGHT: 13.7pt">Filed Pursuant to Rule 497(d)</div>

<div style="FONT-SIZE: 12pt; FONT-FAMILY: 'Times New Roman', serif; TEXT-ALIGN: right; LINE-HEIGHT: 13.7pt">Registration File No.: 333-210770</div>

<div style="FONT-SIZE: 12pt; FONT-FAMILY: 'Times New Roman', serif; FONT-WEIGHT: bold; TEXT-ALIGN: center; MARGIN-TOP: 9pt; LINE-HEIGHT: 13.7pt">BLACKROCK HEALTH SCIENCES TRUST</div>

<div style="FONT-SIZE: 12pt; FONT-FAMILY: 'Times New Roman', serif; FONT-WEIGHT: bold; TEXT-ALIGN: center; MARGIN-TOP: 9pt; LINE-HEIGHT: 13.7pt">Supplement dated August 30, 2017 to the</div>

<div style="FONT-SIZE: 12pt; FONT-FAMILY: 'Times New Roman', serif; FONT-WEIGHT: bold; TEXT-ALIGN: center; LINE-HEIGHT: 13.7pt">Prospectus, dated April 25, 2017 of</div>

<div style="FONT-SIZE: 12pt; FONT-FAMILY: 'Times New Roman', serif; FONT-WEIGHT: bold; TEXT-ALIGN: center; LINE-HEIGHT: 13.7pt">BlackRock Health Sciences Trust</div>

<div style="FONT-SIZE: 12pt; FONT-FAMILY: 'Times New Roman', serif; TEXT-ALIGN: left; MARGIN-TOP: 9pt; LINE-HEIGHT: 13.7pt">This supplement amends certain information in the Prospectus (the &#8220;Prospectus&#8221;), dated April 25, 2017, of BlackRock Health Sciences Trust (the &#8220;Fund&#8221;). Unless otherwise indicated, all other information included in the Prospectus that is not inconsistent with the information set forth in this supplement remains unchanged. Capitalized terms not otherwise defined in this supplement have the same meaning as in the Prospectus.</div>

<div style="FONT-SIZE: 12pt; FONT-FAMILY: 'Times New Roman', serif; TEXT-ALIGN: left; MARGIN-TOP: 9pt; LINE-HEIGHT: 13.7pt">Effective September 5, 2017, the Prospectus is amended as follows:</div>

<div style="FONT-SIZE: 12pt; FONT-FAMILY: 'Times New Roman', serif; FONT-WEIGHT: bold; TEXT-ALIGN: left; MARGIN-TOP: 13.5pt; LINE-HEIGHT: 13.7pt"><u>Item 5 of Part II of the Prospectus</u></div>

<div style="FONT-SIZE: 12pt; FONT-FAMILY: 'Times New Roman', serif; TEXT-ALIGN: left; MARGIN-TOP: 9pt; LINE-HEIGHT: 13.7pt">The fifth paragraph in the section entitled &#8220;Plan of Distribution&#8221; in Item 5 of Part II of the Prospectus is hereby revised in its entirety as follows:</div>

<div style="FONT-SIZE: 12pt; FONT-FAMILY: 'Times New Roman', serif; TEXT-ALIGN: left; MARGIN-TOP: 9pt; LINE-HEIGHT: 13.7pt">Settlements of sales of common shares will occur on the second business day following the date on which any such sales are made.</div>

<div style="FONT-SIZE: 12pt; FONT-FAMILY: 'Times New Roman', serif; FONT-WEIGHT: bold; TEXT-ALIGN: center; MARGIN-TOP: 9pt; LINE-HEIGHT: 13.7pt">Shareholders should retain this supplement for future reference</div>

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