Table 4. Effects of collagen powder on cell viability, pro-collagen type I C peptide production and MMP-1 secretion of HS68 cell and HaCaT cell

Collagen powder (μg/mL)	HaCaT cell		Hs68 cell
	Cell viability (%)	MMP-1 (ng/mL)	Cell viability (%)	pro-collagen type I C (ng/mL)
Control	100.00±3.25	0.54±0.05	100.00±6.94	559.84±28.26
62.5	106.21±5.33	0.81±0.08	104.82±1.17	537.63±13.88
125	98.11±3.42	0.82±0.07	87.65±6.53	406.45±12.42
250	90.29±2.68	0.83±0.06	94.34±4.51	451.71±45.98
500	96.33±3.97	0.84±0.03	89.68±3.24	539.04±1.05
EGCG1)	124.28±3.59***	0.07±0.03***	124.38±3.25***	695.14±42.09**

p<0.05,
p<0.01,
p<0.001.
EGCG, Eepigallocathechingallate was used as positive control.