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What is skin serum, and why should I use it?

  • Skin serum is a lightweight, fast-absorbing skincare product designed to deliver high concentrations of active ingredients to target specific skin concerns. Serums are formulated to penetrate deeply into the skin, providing hydration, nourishment, and addressing issues such as wrinkles, fine lines, dark spots, and uneven texture.

How do I incorporate skin serum into my skincare routine?

  • Skin serum should be incorporated into your daily skincare regimen, following the cleansing and toning of your face, and subsequent moisturization. Employ a modest quantity, typically one or two pumps, of serum onto your fingertips and delicately massage it into your facial and neck skin. Allow a brief interval of 5 to 10 minutes for optimal absorption by your skin. Should your skin demonstrate rapid absorption, signaling dryness, a second application may be warranted. Notably, the efficacy of Serum e4 is most pronounced when employed as the concluding step in your evening or nighttime routine.

How long will the product last?

  • Serum e4 should last for about 2 months for normal skins if applied daily at night on the face and neck (one or two pumps). However, very dry skins may need more hydration and therefore may require applying a larger amount.

Is skin serum suitable for all skin types?

  • Yes, serum e4 is formulated to be suitable for all skin types, including oily, dry, and normal. 

Can I use this product on sensitive skin?

  • Serum e4 has been dermatologically tested and proven to be well tolerated. No reactions were observed. In addition, reviews from users indicate that Serum e4 has been very effective on sensitive skins, including users that reported suffering from psoriasis, eczema, and allergies.
  • However, if you have sensitive skin, it is always recommended to perform a patch test before general application.
  • Please note that this product is not intended to diagnose, treat, cure, or prevent any disease.

Is this product only for mature skin? Is there any age limitation?

  • Serum e4 can be used at any age. It’s never too early to start taking care of your skin! 
  • In fact, we have testimonials from a broad spectrum of users (women, men, and teenagers) confirming that Serum e4 has delivered great results on young and mature skins alike.

Can I use skin serum during pregnancy or while breastfeeding?

  • Due to its content of some essential oils that are not recommended during pregnancies (e.g. Rosemary), please avoid using serum e4 if you are pregnant or breastfeeding.

When can I expect to see results from using skin serum?

  • While some people may notice immediate improvements in hydration and skin texture, it often takes several weeks of consistent use to see significant changes in issues like wrinkles, dark spots, or uneven tone.

Can I layer multiple serums in my skincare routine?

  • Yes, you can layer multiple serums in your skincare routine to address different concerns. However, it’s essential to layer them correctly, starting with the thinnest consistency serum and ending with the thickest. Allow each serum to absorb fully into the skin before applying the next layer.

What should I do if I experience irritation after using the serum?

Are your skin serums cruelty-free and vegan?

  • Yes, all of our skin serums are cruelty-free and formulated without animal-derived ingredients, making them suitable for vegans. We are committed to ethical practices and ensuring our products meet high standards of quality and sustainability.

Is serum e4 fragrance-free?

  • Serum e4 does not include any synthetic fragrances or colors. The bright yellowish-orange color and the floral-spicy scent come directly from the botanicals.

What are your shipping options and costs?

  • Currently, we only ship to North America and Canada.
  • Shipping is free for orders above $100
  • We ship using USPS and we target shipping your order within 5 business days

What is your return policy?

  • At Eguz-bó, we strive for your utmost satisfaction with our skin serum products. However, we understand that there may be instances where you need to return or exchange your purchase. Therefore, we have crafted the following return policy to ensure a smooth and hassle-free experience:
    • We accept returns within 14 days of the original purchase date
    • To initiate a return, please contact our customer service team at
    • Our team will guide you through the return process and provide you with further instructions
    • Shipping:
      • Customers are responsible for paying the shipping costs associated with returning the item
      • Shipping costs are non-refundable
  • Please note that this return policy applies only to purchases made directly through Eguz-bó. If you have purchased our products from a third-party retailer, please refer to their return policy for assistance.
  • If you have any questions or concerns regarding our return policy, feel free to reach out to us. Your satisfaction is our top priority, and we are committed to ensuring a positive experience with Eguz-bó skincare products.

How can I reach customer service if I have more questions?

  • Email us at