Well, it's seaweed, Lori. kelp,and /or algae which is claimed to contain iodine,
which (too much of) can probably affect the thyroid
http://www.holisticbird.org/diet/seaveg.htm I wouldn't feed that to my cat, she
seems in balance, sometimes hyper/happy playful and sometimes "nappish" which
seems appropropriate for a cat and there's nothing to indicate, according to vet
that she's got a thyroid problem.  I looked at seaveg.com and see no reference
to cancer on their web page nor in the testimonials. Looks like they're pushing
it for "healing" or healthy snacks. If you find that Curt's developed a "like"
for it, maybe the Strontium affected his thyroid - bloodwork could check for
that, I think.

Apparently it's high in potassium and calcium rich . (Annie Appleseed webpage)
Apparently when cancer's in the bones, the calcium levels can become elevated,
so I wouldn't want him taking that. First paragragh here shows what could happen
in hypercalcemia http://www.cancersupportivecare.com/hypercalcemia.html
It would have to be treated see paragraph "Moderate to Severe Hypercalcemia"

I thought he just had an injection of Lupron and another's not due for 3 months?

http://www.prostate-cancer.org/education/boneintg/Strum_BoneIntegrityNatlHist.html

(which mentions apoptosis) (cell death)

http://www.innvista.com/health/foods/vegetables/seaveg.htm
Sea vegetables is the new, trendy term for seaweed or marine algae.
(elaborates on types and ingredients)

There's recipes here http://www.annieappleseedproject.org/seaveg.html (claimed
to be a detoxifier).
I'd try some in a soup or salad, once in a while or when dining out.
That web page also references a PubMed for breast cancer, from Japan.
(which also mentions apoptosis, but remember that anything, in large enough
quantity, can probably kill a single cancer cell, in vitro ).

Algae is under False Claims and Hype at
http://www.quackwatch.org/01QuackeryRelatedTopics/algae.html

So my conclusion is, if he thinks he's low in some of the vitamins or minerals,
he could probably do just as well, eating a healthy diet and supplementing with
some of the drug store vitamins and/or minerals and save  a whole lot of money.
If he thinks his thyroid's malfunctioning, he probably get that checked by his
doctor.

I've tried to "logic" this through as to the pros and cons so you'll know I gave
it a fair chance.
Now watch, after all this, Steph'll probably post that it's newagey bunkum (for
cancer), which it is. <g>
J