There are slight differences in the meanings of these terms, but they are often used interchangeably. 1  Independent Variable: It implies causality: the independent variable affects the dependent variable. 2  Used predominantly in ANOVA, but often in regression as well. 3  It can be either continuous or categorical.
Protein Quality. Collagen is not a complete protein because it is lacking in the amino acid tryptophan. A Protein Digestibility Corrected Amino Acid Score (PDCAA) of a complete protein is 1.0.ollagen is a protein found in the muscle and connective tissue of animals. Hydrolyzed collagen protein supplements are typically made from the bones and skin of cows, horses or pigs.
Collagen Type II also provides 60 percent collagen protein. Collagen protein is unique in containing the amino acids hydroxylysine and hydroxyproline. In a study using hydrolyzed collagen, the subjects receiving collagen had significantly higher blood levels of hydroxyproline than those receiving placebo.iven the importance of HA for healthy skin and joints, its high turnover and ânormalâ decrease with aging, an effective, absorbable source of HA is highly desirable. Fortunately a bioavailable source of HA is now available: chicken sternum type II collagen.