202 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS Baseline Product Use •4.5 • 4 g 3.5 .J '• 3 _ •2.5: E :• 1.5 0.5 0 1 2 3 4 5 6 7 8 9 1011121314 Days :4.5 •4 3.5 •3 2.5 2 .5 I o.5 1 2 3 4 5 6 7 8 9 10111213141516171819202122232425262728 Days _•l Dimethlcone-contaimng 2qn-1 Shampoo -e-)- Non-dlmethlcone-conta•mng Shampoo -•- D•methicone-conta•mng Shampoo Figure 3. Mean daily anagen hair loss during baseline and product use periods. ciency (1.2%), hereditary predilection (1.7%), and acute or chronic illness (2.7%) were not perceived as likely causes of hair fall. DISCUSSION The results of this clinical study support a prior premise that dimethicone and non- dimethicone-containing shampoos do not affect daily hair loss rates. In this study, we observed mean hair loss rates ranging from 28 to 35 hairs per day. While published estimates of daily hair loss rates range from 38.4 to 180 hairs (2-7), this study provides Baseline Product Use 20 •16 jo 14 •12 'l- B lO • 8 E • 6 2 0 1 2 3 4 5 6 7 8 9 1011121314 Days 2O 18 •14 :10 8 •6 4 L2 0 1 2 3 4 5 6 7 8 9 10111213141516171819202122232425262728 Days l•_ Dimethlcone-contalnlng 2-1nil Shampoo + NOnldlmethlcone-containlng Shampoo -•- D•methicone-contalning Shampoo Figure 4. Mean daily broken hair loss during baseline and product use periods.

ABSENCE OF EFFECTS OF DIMETHICONE ON HAIR LOSS 203 • • ... 000 000 000 000