Firm + Replenish Serum
Firm + Replenish

Firm + Replenish Serum features a double dose of b-silk™ protein to reestablish skin’s barrier after cleansing and exfoliating. Like a silk scarf, b-silk™ protein forms a lightweight barrier that locks restorative ingredients in and keeps environmental stressors at bay. Serum replenishes your skin’s Natural Moisturizing Factor for more youthful skin. Over time, b-silk™ protein works to lift and firm skin.

For use on all skin types. Apply one to two pumps to face, neck, and décolletage after cleansing and/or exfoliating in the AM and PM. Layer underneath Revitalizing Hydrogel Moisturizer or Hydrate + Restore Rich Cream for added benefits. Firm + Replenish Serum can be used on top of your active treatments and oils to lock in benefits. 

Water (Aqua), Squalane, Pentylene Glycol, Silk Protein (sr-Spider Silk Protein), Sodium Hyaluronate Crosspolymer (Hyaluronic Acid), Ceramide AP, Ceramide EOP, Ceramide NP, Alanine, Arginine, Aspartic Acid, Glycine, Histidine, Isoleucine, Phenylalanine, Proline, Serine, Threonine, Valine, Cholesterol, PCA, Sodium PCA, Sodium Lactate, Phytosphingosine, Sodium Lauroyl Lactylate, Hydroxyethyl Acrylate/Sodium Acryloyldimethyl Taurate Copolymer, Xanthan Gum, Carbomer, Polysorbate 60, Hexylene Glycol, Ethylhexylglycerin, Caprylyl Glycol, Sorbitan Isostearate, Disodium EDTA, Phenoxyethanol.

Vegan, cruelty-free, and Leaping Bunny certified. 


Your concentrated boost of b-silk™ protein.

Consider our Firm + Replenish Serum your essential layer of reinforcement.

Improves the feel of skin texture for a more youthful, glowing appearance

Works to reduce the appearance of fine lines and give skin a firmer appearance over time

Replenishes the skin’s Natural Moisturizing Factor (the components your skin naturally makes to keep the epidermis hydrated)

Scientifically designed, scientifically tested.

Our clinical trial for b-silk™ protein at 4 and 8 weeks showed continuous improvement in the texture and appearance of skin.

Skin appears firmer


Skin feels smoother to the touch


Skin feels nourished


Skin appears firmer


Skin feels smoother to the touch


Skin feels nourished


50 reviews

100% of reviewers would recommend this product to a friend.






Effortless and Effective

My skincare regiment is pretty low-maintenance, but this serum has convinced me to add another step to my routine. It glides on smoothly and instantly improves my skin's texture without feeling heavy or oily. I also love that it pairs well with the EighteenB hydrogel moisturizer, which I use daily under my sunscreen and makeup - and everything just glides on effortlessly on top of it. Also, I feel like I am giving my face an added layer of protection against all of the pollutants I encounter living in NYC. I highly recommend trying this product!

This serum really works!

I am 62 and after two weeks of using Eighteen B serum, the skin around my face and neck visibly firmed up. Any woman my age would love this product!

Instantly addicted!

light and refreshing feeling going on and tightens my skin over night. My face has never looked and felt better. I don’t want to use any other ant-aging products again.

A Gamechanger

I have never experienced a serum like this- not only is it a dream to apply, but I see real, visible results. It pairs so well with my retinol and vitamin C serums- as if it locks in the treatment while keeping my skin noticeably hydrated. I feel naked without applying it!

I 100% love this serum...

I love this serum so much I practically bathe in it. It is the perfect texture. Although a lot goes a long wait I find I want it everywhere and thus use probably 4 or 5 pumps...Not sure if that is too much but I don't care because I am getting really amazing feedback about my skin. Not sure if is the serum or the rich cream but I BET it is both of them combined. LOVE YOU GUYS!!!

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