Please note: We are experiencing shipping delays of 7-10 days due to COVID19    |   Free shipping for USA orders $95+     |     Free samples for ALL orders $45+

L4B ABC Serum (Allantoin + Bakuchiol 2% + Vitamin C)


or 4 installments of $17.50 by Afterpay More info

What is the L4B?

moss founder Celestyna created the L4B as a place to fulfill her curiosity and creativity. New ingredients, formulations, and techniques are tested, including ultra powerful and specific products Celestyna creates for her seasonal needs. Some of these exceptional creations we make available for you as couture experimental skincare – extremely limited quantity and always expertly hand-crafted by the proprietress herself.

At the end of the year we consult all of our L4B participants and consider adding a favorite L4B formulation to the permanent moss collection.

Please note, due to the foundational concept of the lab, each batch will vary slightly – it may have slightly different ingredients and different percentages of ingredients. The L4B is NOT a conventional, static skincare line – it is a formulator’s playground.




The concept:

Try bakuchiol – the plant-based retinol dupe that creates the exact same skin renewal that makes retinol the ingredient millions reach for when addressing acne or fine lines but without the irritation or safety concerns of retinol.

ABC Serum: Allantoin + Bakuchiol (2%) + Vitamin C: A lightweight serum with soothing Allantoin, brightening Vitamin C and hero ingredient phyto-active retinol analog (Bakuchiol.)


“I recently ordered the Bakuchoil ABC serum (not the oil). My understanding is that it is a temporary product from the L4B lab, so I wanted to write to basically beg you guys to make it a permanent product. It has seriously helped with my acne and is the only thing that has helped it in a long time, but didn’t dry out my face. Please don’t stop making this product! Thank you!!” – Rachel W.

“Speaking of glow, the ABC Serum has been awesome as well… My face gets that glowy, lit from within look when I use the ABC Serum. Thank you so very much for the skincare treasures that you create.” -Kathryn R.




Size: 20ml


Water, Abyssinian Oil, Bakuchiol, Dimethyl Isosorbide, Ammonium Acryloyldimethyltaurate/VP Copolymer, Tetrahexyldecyl Ascorbate, Allantoin, Caprylhydroxamic acid, Glyceryl Caprylate, Glycerin, Gluconodeltalactone, Blue Butterfly Pea Extract


Apply sparingly to clean skin. Avoid using other cellular renewal products (such as exfoliants) at the same time.

  • No products in the cart.

Our CommitKits are available to subscribers only.


CommitKits give you 20% off expert-curated skincare routines, a savings of over $100!