Ummm - I wouldn't exactly describe myself as 'an expert' but as I suspected, the added ingredients in the Holland & Barrett stuff DOES contain carbs. For someone on a normal diet, this wouldn't pose much of a problem but from someone on a ketogenic diet such as ours, I think there's a chance it could have an effect.
The recommended dose is, I believe, 10g per day (I have more than that - but am only having the whole PH) and 9g of carbs in a 10g scoop seems like it's almost entirely carb! It also has a hefty calorie count.
To be honest, I'd stick with the WHOLE PSYLLIUM HUSKS with NO additives. You know for sure then that it CANNOT affect your diet.
I've put in a link to a good place to get them where you can also get discounts if you purchase a gold card (£5 for a year which gives you 20% saving on ALL purchases: you recoup this with what you save on just a couple of pots or so of PH!) They also have High Street shops throughout the UK.
Here's the link again .. the company is called GNC. I don't know if they charge postage because I go into the shop in Chichester to get mine.
GNC
Hope this helps!