Yes, so they tell me. But I have a better solution for lactose intolerance. Kill your yeast. Candida overgrowth causes lactose intolerance. That's how it's treated, I'm surprised you haven't already been treated for that. There is a lot of info as to why, which you can google if you like. But basically the yeast mess with your ability to digest. Most pages look like this:

example

Scrolling through you'll always find "lactose intolerance" as part of the list of symptoms. The treatment, if I were to prescribe would be:

nystatin (prescription anti-fungal)
Threelac
Oxygen elements

The bottom two are effective enough. The nystatin is often used but in this country it isn't pure, it is in a capsule that contains... lactose. So perhaps not good for you just yet. Threelac is expensive as far as "probiotics" go, but it isn't an ordinary probiotic. You will get serious die-off symptoms from it because it was specifically designed to target candida and it survives the stomach acid (unlike regular probiotics where only 2% get to the gut). Seriously, you have nothing to lose, well, you have some money to lose. But it is worth the risk, I'd reckon. You can get threelac on ebay too, but I found that place a little cheaper. You will also need to go on a candida diet for the best effect and most long lasting (they are TOUGH to keep away, they come back). You can find one of those all over the net, but I can link one if you prefer. Let me know. The diet bit is the hardest part, but you get used to it and it's only for a while. If nothing else, go off yeast and simple sugars. Taking just the threelac on it's own should be enough for some temporary relief if you really can't do the diet or get anything else.

Gotta run. Let me know if you have any questions cos I've left a whole buncha info out.