Science
Mechanism of Action
Geranylgeraniol (GGOH) is integral to the mevalonate pathway, serving as a biological precursor for vital molecules such as CoQ10, vitamin K2 (menaquinone-4), and vitamin E. It also plays a crucial role in protein prenylation, a post-translational modification that impacts various cellular processes including signal transduction, cell growth, and the structural integrity and localization of proteins within membranes. Applied topically, GGOH is believed to offer antioxidant protection against oxidative stress and enhance skin conditioning, thereby contributing to robust cell membrane health and promoting enhanced skin elasticity and hydration.
Research
Clinical Evidence
Low confidence0.1%
Key findings
- 01 A U.S. Patent (5,756,109A) indicates that Geranylgeraniol, when formulated with retinol or retinyl esters, can substantially improve their efficacy in conditioning and smoothing skin, as well as reducing the appearance of wrinkles. This patent suggests a concentration range of 0.0001% to 50% for this synergistic effect, with a preference for 0.01% to 10%, and most preferably 0.1% to 5%. It is important to note that this range is derived from a formulation patent and not from standalone clinical efficacy studies of Geranylgeraniol.
Transparency
Dusting Analysis
The Formula
Formulation
Stability
Geranylgeraniol is practically insoluble in water but highly soluble in organic solvents such as DMSO and dimethyl formamide (approximately 30 mg/ml). For integration into aqueous systems, it can be predissolved in ethanol before dilution with the aqueous phase. The use of self-emulsifying systems is suggested to improve its solubility and dissolution within cosmetic formulations, thereby potentially enhancing product stability. There is no explicitly defined optimal pH range for its stability in topical cosmetic formulations.
Synergies
- Retinol
- Retinyl Esters
Safety
Safety Profile
Geranylgeraniol has been granted Generally Recognized as Safe (GRAS) status by an independent panel of experts for its use in foods and beverages. A 90-day repeated-dose oral toxicity study in rats established a no observed adverse effect level (NOAEL) for systemic effects at 725 mg/kg bw/day. However, local adverse effects were observed in the forestomach at all tested oral dose levels (725, 1450, and 2900 mg/kg bw/day), and in the liver at intermediate and high doses. These safety assessments specifically pertain to oral ingestion. No dedicated Cosmetic Ingredient Review (CIR) or Scientific Committee on Consumer Safety (SCCS) reports regarding the topical cosmetic use of Geranylgeraniol have been found.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Geranylgeraniol is a biochemically relevant isoprenoid with promising antioxidant and skin-conditioning attributes, notably valuable for its patented synergistic effects when combined with retinoids in anti-aging formulations.
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