It's not really hoodia in the Phytobase product, they pack it with other products such as fibers that swell and mimic a full feeling.
Have you heard the latest news about hoodia? First Pfizer Pharmaceuticals pulled out after spending millions of dollars and could not create a hoodia product that actually worked. Then Unilever (major company, also produces SlimFast) jumped in and spent millions more. A couple of months ago, they thought they finally had a viable product they could market. However,
safety tests on humans failed. The subjects became very ill, and none had significant impact on appetite and calorie reduction. Unilever has officially pulled out.
If these two major and very reputable corporations spent millions and millions of dollars and still couldn't create a hoodia product that worked, why would all the mass marketed unknown brands be any better? It's all a marketing scam
The only known way for hoodia gordonii to work is by eating a chunk of the fresh plant, about 4 inches worth. Even then, there have been no safety tests. Bushmen don't exactly undergo routine medical exams and monitoring. They also don't eat it every day, it's something used occasionally when they go on long hunts in the desert, and not for weight loss.
The whole hoodia scam industry bothers me

They take advantage of the rest of us.