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Reported tolerability of niacin and placebo
| Tolerability, No. (%) | Niacin (n = 33) | Placebo (n-35) |
| No effect | 0 (0) | 34 (97.1) |
| Easy to tolerate | 2 (6.1) | 1 (2.9) |
| Mildly unpleasant, but tolerable | 14 (42.4) | 0 (0) |
| Unpleasant, and difficult to tolerate | 11 (33.3) | 0 (0) |
| Intolerable, and would never take niacin again | 6 (18.2) | 0 (0) |
