I'll be entirely honest and say you didn't 'cacth it just in time' if your pony was already lame when you brought him in. (assuming lame, as otherwise, how was he noticably better in three days?!)

The Laminitis Clinic (the nationally recognised veterinary experts on Laminitis) advise keeping a pony in on box rest for 30 days once it is sound, so the laminae can repair fully. If you turn out/work the pony prior to that, you are risking rotation and/or founder, and a pony that may have to be PTS.

Laminitis and it's mis- management kills more horses and ponies in this country than any other single cause. It is VERY serious and horses do not even have to be noticably lame to have severe rotation.

In what way do you feel the supplement you have been feeding has helped?