As I said before, the psyllium powder without all the extra added ingredients does it for me and it's cheaper than the alternatives - cheaper even than the psyllium husks at the supermarket.

I use one heaped teaspoon three times per week in my fruit shakes and it works like a charm.

This page says that the powder is more concentrated than the husks so you need to take less of it:

Psyllium Husks vs. Psyllium Powder

I buy powder - or husks - in a packet, not capsules because capsules are a more expensive way to pay for it.

I just looked up the supermarket prices for psyllium husk vs psyllium powder. Husk is $2.82 per 100G and powder is $1.78 per 100G which is odd to me because the powder is more effective compared with the husk, and the capsules are on special at $33 (normally $39) for 160 caps, which is a miniscule amount compared with a heaped teaspoon from a packet of powder.

Blending powder or husk into a shake makes it a lot easier to drink, rather than just mixing it into a cup of liquid of your choice because it just becomes part of the drink. I don't even notice it. I made the terrible mistake of trying to take it in a cup of water and it glugged up in seconds, and no matter how many times I refilled the cup and mixed it up it still wasn't going down without a fight.