My mare’s mane and tail are long but not super thick. Is there anything on the market that I can use to rebuild it? I have heard of a few products but I’m not quite sure about them

I use MTG, whatever you do, DO NOT BRUSH! Pick with your fingers.
Some horses are naturally predisposed to thin manes and tails. Keeping the ends trimmed neatly will make it look thicker, and if she's rubbed any out, MTG can help it grow back (and can help keep the skin in good condition if she naturally has dry skin). An omega-3/biotin supplement wouldn't hurt either, I've heard good things about flax.
Bio mane! I use it and it works REALLY well
Join the fun and sign up to connect with our 200,000 members!