Earth Harbor Celestine Hydra-Peptide Replenishing Serum

Important note on peptide and hydration serums

Hydrating serums are designed to support the skin barrier while helping the skin retain moisture. Many formulas combine humectants, peptides, amino acids, and botanical extracts to help the skin appear smoother and more balanced.

Peptides and amino acids are often included in these formulas because they help support skin structure and may improve hydration and elasticity over time.

What I avoid in serums

When I evaluate serums, I try to avoid ingredients that can disrupt the skin barrier or contribute to unnecessary chemical exposure. These often include:

• undisclosed fragrance or parfum
• PEG compounds or ethoxylated ingredients
• petroleum-derived fillers such as mineral oil or dimethicone
• harsh preservative systems

I also look closely at ingredient sourcing and formulation simplicity, especially for products used daily.

Product description

Earth Harbor Celestine Hydra-Peptide Replenishing Serum is a lightweight hydrating serum designed to help support the skin barrier and maintain moisture.

The formula combines humectants such as glycerin, propanediol, tremella mushroom extract, and sodium hyaluronate to help attract and retain hydration in the skin.

Fermented sea kelp, seaweed extracts, and plant-derived amino acids are included to support skin balance and overall skin comfort. Niacinamide and botanical extracts such as pomegranate, turmeric, and holy basil help support the appearance of healthy skin.

Plant-derived emollients, including squalane and coconut-derived lipids, help soften the skin while maintaining a lightweight texture that absorbs easily.

What I like

I like that this serum focuses on hydration and skin barrier support using a combination of humectants, amino acids, and botanical extracts.

The formula feels lightweight and layers easily under moisturizer, making it a simple addition to both morning and evening routines.

The combination of peptides, amino acids, and hydrating ingredients can help maintain skin moisture and overall comfort.

Things to keep in mind

The EWG analyzer score for this product is a 5. In many cases, this rating is influenced by potential contamination concerns associated with certain naturally derived ingredients such as algae extracts, lecithin, or betaine. These concerns often relate to environmental contamination rather than the ingredients themselves.

Ingredient sourcing and manufacturing practices play a significant role in these concerns, which is why I pay attention to brands that prioritize responsible sourcing and formulation.

Essential oils can carry trace contaminants depending on their sourcing and processing, which is why I prioritize brands that use third-party testing and adhere to ingredient quality standards to help minimize contaminants.