Can anyone administer HGH? or does it have to be administered
by a nurse or Doctor if it is injectable? Or is every state
different? How would I find out the regulation of each state?

At http://www.2-exclamations-4-hgh-human-growth-hormone-spray.com/hgh-injections.htm
is the following statement: “Some doctors will want you to come into
the office or a clinic to get your injection every day.  Others may
prescribe self-administration, and teach you how to do it yourself. 
The invention of the hgh injection "pen" has made self administration
somewhat less complicated.”

So it appears that self-injection is not illegal in itself, but the
person supplying the HGH can decide whether or not to allow this. 
Obviously, any HGH obtained from online suppliers would have to be
self-administered.  Please note though, as mentioned below, that HGH
is a controlled substance in some states and there are restrictions on
its purchase, even with a prescription.

http://www.rxhgh.com/ seems to have the most extensive information on
the use of human growth hormone and on how to obtain it.  According to
information on this site,
 “As long as the prescription is written by a licensed physician, a
person can obtain a prescription in person, on the phone, through the
mail, or online. While seeing a doctor in person is the safest way to
obtain a prescription, other ways are legal.”   The site does mention
that while the purchase of HGH does not violate Federal law, as long
as a prescription is obtained, there are restrictions on purchase in
some states, where it is listed as a controlled substance.  These
states are not listed, however, you can contact RxHGH for further
information and ask them about the situation in the states that
interest you: E-Mail: info@rxhgh.com  Postal Mail: Rx HGH.com, 1387 N.
Crestmont Dr., Meridian, ID 83642-2169 , Phone: (208) 887-2278

A list of local clinics offering HGH is available at
http://www.rxhgh.com/antiage.shtm
A list of online clinics appears at the bottom of the home page:
http://www.rxhgh.com/index.shtml

The list of local clinics shows that they are based in Arizona,
California, Colorado, Connecticut, Florida, Georgia, Hawaii, Illinois,
Indiana, Maryland, Michigan, Missouri, Nebraska, Nevada, New Jersey,
New Mexico, New York, Ohio, Oregon, Pennsylvania, South Carolina,
Texas, Virginia, Washington.

Some advice from the FDA about buying online:
http://www.fda.gov/oc/buyonline/default.html

Some tips on using HGH and how to self-administer it by injection:
http://www.rxhgh.com/tips.html

Search strategy: I started from the RxHGH.com site, of which I was
already aware. On Google: HGH, state legislation; HGH, restricted

After a few hours of serching everything from the FDA's website to
auctual manufacturer's websites it was clear that there are no fact
pages put together.  Most of the websites I found were quite
opinionated in either one way or another.  It appears that to obtain
HGH you need a persciption, but anyone may administer it to
themselves. Here are a few pages with information pertaining to usage.
There are also numerous pages regaurding taking HGH orally.  However
you asked for injection information so I left them out.

http://www.hgh-info.com/faqs.html

http://www.glutathione.net/hghlink.htm

http://www.mesomorphosis.com/steroid-profiles/human-growth-hormone.htm
---From what this website says it appears that anyone can administer
an injection to his/her self.