Andrographis from seed?

Have any of you were able to grow andrographis paniculata from seed? I want to grow it as it is a great herb from infections and as cold/flu preventative and healer. And now that I read it helps to prevent migraines, I have to grow it. However I read starting from seed can be tricky. What is your experience? I didn't see any plants for sale, only the seeds.

It's been a few years...I remember germination was good and the plants did well for a season in pots.  It's an annual so I tried to let it go to seed...it had really amazing tiny flowers.  Anyway, I didn't get any mature seed, but a friend that I gave some plants to did.  I just ran across them and thought about planting again but it's two? years old now  

I bought seeds for  both andrographis and astragalus from Richter's.....I have had very good success with their herb seeds.
The astragalus germinated well also and I had plants that survived the winter for three years but I see this spring it's not coming back.

I do remember scarifying the seed with sandpaper, keeping the flat moist and warm, and also found that the leftover seed in the packet wasn't viable two years later.

Thank you, Judith, that is a very useful information. So their seed has to be very fresh, maybe that's why many people have trouble germinating them. Good supplier is the key.