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Thanks for all the replies about horseradish.

Several suggested making my own by buying horseradish root and grating it.

Here are the other replies:

Boar's Head was mentioned several times.

Manischewitz grated Horseradish
Ingredients:  horseradish, passover cider vinegar, cottonseed oil, salt,
sodium bisulfate (preserve) and flavoring.

Silver Springs Horseradish was mentioned as safe.
Gold's Horseradish was also mentioned.

There are several I have found without vinegar (use water)

If you have an oriental market, check out wasabi, which is Japanese dried
horseradish.. Read labels carefully because some are not gf.  Just add the
powder to sour cream  or gf vinegar and spices.

Some days ago I used fresh horseradish. I grated it, added some cream,
salt, lemon, a boiled egg yoke - it was delicious and much better than the
bought horesradish in a glass. And it was not too much work. The only
problem - my eyes started crying because the horseradish was so hot. ;-)

It is really easy to make - actually less of a hassle than shoping - just
grind it up in your blender, then add gf vinegar to moisten.

You can find the root in the produce section of the market...just peel and
grate.  It is much better than the prepared kind.  You can also keep the
left over fresh grated horseradish in the freezer to use in the future.  It
is good mixed with sour cream.  If you like pour some rice vinegar on it and
keep it in a jar in the refrigerator..you may want to process this first to
make it like store bought.

Thanks again.

Joan Van Loozenoord
Denver, Colorado