Since no adequate studies have been conducted on the safety and effectiveness of hoodia, dosing for the supplement has not been established. Reports suggest that most hoodia products contain little or no hoodia, so even if your particular product lists a recommended hoodia dosage, it may not actually contain the right amount. Check with your pharmacist to see which manufacturers are most reputable.
At this point, almost nothing is known about the best hoodia dosage. For medications, studies are usually performed to determine the most appropriate dose that is both safe and effective. However, no such studies have been performed and published about hoodia. Although many hoodia products are currently available, it seems that these products were probably brought to market too early, before enough information was available.
Importantly, because supplements are very loosely regulated, they sometimes do not contain the right ingredient in the right amount. Some reports have suggested that the majority of hoodia products actually contain little or no hoodia. Therefore, even if your particular hoodia product lists a recommended dosage, the product may not actually contain the right amount (and you may have no idea what hoodia dosage you are taking).
If you are determined to try hoodia, make sure the manufacturer of your hoodia product is a trusted and reputable manufacturer. It is a good sign if a manufacturer abides by the rules of Good Manufacturing Practices (GMP). It is also a good sign if a product has the United States Pharmacopoeia (USP) seal, which means that the product has been independently tested and shown to contain the correct ingredients in the amounts listed on the label. Your pharmacist is a good resource for information about which manufacturers are most reputable.