Proven and supported by independent studies. Outstanding active ingredient for most skin types or concerns.

Necessary to improve a formulas texture, stability, or penetration. Also includes non-irritating, effective ingredients.

Generally non-irritating but may have aesthetic, stability, or other issues that limit its usefulness.

There is a likelihood of irritation. Risk increases when combined with other problematic ingredients.

May cause irritation, inflammation, dryness, etc. May offer benefit in some capability but overall, proven to do harm than good.