This page came up in the first 5 or 6 hits with a google of 'sage milk oversupply', so I felt compelled to join and share my experience.

Oversupply can be a really horrible problem, it hospitalized my wife with our first, resulted in her being pumped with antibiotics, and wasn't really resolved until we 'gave up' and had her go back on the birth control pill when my first was 2 months old. This didn't end her supply, but made it normal. She weaned when my son was exactly one year, and was ready.

Anyhow, we just had our second, and had a nasty fright a few days ago when her supply came back and began to create the thick, incredibly stiff knots that gave her a fever of 106 F last time. We felt like the clock was ticking and were desperate, with only bad options, go straight back on an estrogen-combo pill and nurse, bombarding my kid with estrogen while he still has puffy nipples from the estrogen at birth, or go straight to formula, and ruin the bonding and better immune system that comes with breast feeding (incidentally, our first is remarkably healthy in that way, zero ear infections, zero animal allergies, no more than a dozen real colds in his first three years).

I was open to the homeopathic route, because we had remarkable success with cranberry tea and primrose in inducing labor (worked in just hours). So, I went to a local health foods place, bought "loose bulk" sage tea, and made some. This isn't quite as easy as it sounds, many health food places stock dozens and dozens of packaged herbal teas but don't carry this. Odd, for something used medicinally in many cultures for thousands of years. In the states, I believe you can special-order it from Alvita. Anyhow, they had loose bulk, I bought some along with a few of the burlap-looking mesh bags (sage is too fine for the metal balls). At first, we made iced tea, which didn't have a fast effect, but then I realized that infusing it with boiling water would probably be preferable in terms of getting the effect sought. So, I stuffed a good 2 tablespoons into the small tea bag, and began to make nice, dark tea in a mug every three hours.

A couple of days later, it seems to have worked incredibly well. My wife also thinks that 'block feeding' - feeding exclusively from one breast at a time in 6-hour or so chunks - helps. The knots are gone, and the supply is relatively normal (still on the huge supply of normal), and the hindmilk is translating to nice, deep naps which means I can type this while she gets work done.

Anyhow, just one person's testimony. The frustration and condescension one experiences with this problem can be extremely frustrating ("oh, aren't you lucky!" "you call that a problem?" etc). There are very, very few medical professionals with a clue on this one, and no real studies of the problem with real research methodology. But I thought I would put my experience up there.

I can see why people are hesitant to recommend this out of fear that their supply will be entirely ended, but if you're on the very extreme end of the spectrum, as my wife obviously is, it is an option which I would consider. Obviously, I'm not a health professional, and this is not medical advice.

Hope this gets me some good karma! You aren't alone. Good luck!