Table 2.
Trans-Resveratrol abundance in 14 food supplements purchased online and actual amounts delivered to the consumers.
| Sample | Form a | Purity on-label | Trans-Resveratrol b | Deviation | Posology | Actual dosage c | Value per cps d |
|---|---|---|---|---|---|---|---|
| % | % | % | cps/die | mg | US Dollars | ||
| PC001 | P | 50 | 49.90 ± 1.94 | −0.2 | 1 | 249.5 | 0.77 (0.6) |
| PC002 | P | 99 | 95.18 ± 1.79 | −3.82 | 1 | 480.9 | 1.44 (0.58) |
| PC003 | P | 98 | 99.03 ± 1.59 | 1.03 | 1 | 506.5 | 0.73 (0.3) |
| PC004 | P | 50 | 46.21 ± 1.10 | −7.58 | 1 | 227.2 | 0.37 (0.32) |
| PC005 | P | 99 | 63.82 ± 0.35 | −35.53 | 1 | 322.5 | 0.93 (0.58) |
| PC006 | P | 99 | 99.07 ± 0.92 | 0.07 | 1 | 501 | 2.5 (1) |
| PC007 | M | 98 | 39.59 ± 0.81 | −60 | 1 | 120 | 1.1 (1.84) |
| PC008 | M | 27 | 22.48 ± 0.36 | −16.74 | 1 | 270.7 | 1.23 (0.9) |
| PC009 | M | - | <0.4 | n.a. | 1 | n.a. | n.a. |
| PC010 | P | 20 | 22.18 ± 0.98 | 11 | 2 | 55.5 | 0.2 (0.72) |
| PC011 | M | 10.7 | 9.17 ± 0.11 | −14.3 | 2 | 128.5 | 0.22 (0.34) |
| PC012 | M | 1.3 | <0.4 | n.a. | 4 | n.a. | n.a. |
| PC013 | M | 33 | 14.92 ± 0.37 | −54.79 | 2 | 180.8 | 0.67 (0.74) |
| PC014 | M | 15 | 15.05 ± 0.53 | 0,05 | 2 | 226 | 0.41 (0.36) |
Legend: a P = Pure, M = Multi-ingredient; b obtained with an HPLC validated method; c calculated according to on-label dosage and suggested daily posology; d per 200 mg of actual trans-resveratrol, calculated according to actual number of capsules per package and price at the moment of purchase.