Mare Magic (and or calming supplements for mares)? Please help!

Sorry you're having to deal with all of this. First of all, as mentioned above, you need to rule out anything medical or diet related as well as fit of tack. Next take a look at her training. Does she know that behavior is inappropriate? And what are you doing to correct her? If everything checks out medically, it wouldn't hurt to try Mare Magic.

I put my moody, bossy, dominant mare on it to take the edge off so we can train, and I have had no problems with it. In order for her to function, she needs her Mare Magic. It takes a couple weeks to start seeing full results, but it works great.

As always though, you must take the lead and firmly tell her "NO" to her antics. And continue with ground training until you are comfortable with riding her again. I've seen this time and time again, where a horse will walk all over it's handler because it has the upper hand and knows it. Don't let her dominate you - be a firm but gentle leader. This is where you must be MOM. Give it time, it will get better. Good luck :)

This doesn't sound like the mare has un-balanced hormones in my opinion. Mare magic/red raspberry leaves is for estrogen dominance and balancing hormones. Assuming a supplement will take care of a whole lot of behavioral issues is a far leap ;) Typically estrogen dominant mares will be moody, grumpy, lazy, cinchy, reluctant to work, sometimes act colicy from cramps, be dominant in the pasture, hard to or un-able to get in foal...

Without seeing her and going only on your description I would chalk a great deal of this up to the mare needing a trainer or a confident handler to have a good smack down with her. It isn't at all uncommon to hear of someone who took in a under the weather horse & loved the horse only to find that a few months down the road the horse was a lot different when his/her health was back up to par. I have ended up with more Thoroughbreds than I can count because of this ;) There are a lot of people who keep a Thoroughbred thin because they are easier to handle. I do not agree that this is right, but I personally know of many.

It sounds mostly training related to me but looking into deficiency possibilities to help the training process is always a great idea.

You can take a look at my website, or google things for yourself, to see if anything fits the bill. Natural horse - New Image Training Center

Right off the top of my head I'd say:

Magnesium deficiency can make a horse hot, nervous, flighty, un-able to handle stress etc...

Calcium deficiency can make the nerve endings raw and can give you a "crazy" horse.

Valerian root is commonly used to decrease nervous conditions in horses, it is a mild calmative and anti-spasmatic.

Vervain flower essence helps animals always wanting to be involved, high strung & with fixed ideas that they are right.

Deficiencies can cause major side effects and coming from any rescue situation you are almost guaranteed a deficiency or an emotional train wreck. Supplements, herbs and oils will help this but if there is an under lineing training problem they will not train the horse for you :)