Spa & Beauty Today Editors' Picks: Apothecary-Inspired Bath Soaks, Shape-Shifting Fragrance, Retinol Hand Cream, and More Beauty and Wellness Launches We Love

[Photo credit: Lance Reis]

Over the past few months, there have been many exciting and innovative new launches in beauty and wellness. From the ultimate ‘80s/’90s-inspired collab between two iconic African American heritage brands to a “Gumball Lips Collection” from K-beauty brand MIXIK SKIN, whipped gold shimmer SPF from Vacation, a wearable red light therapy device that can be used just about anywhere on the body, and much more—there is plenty to be excited about.

Read on to discover and shop our latest Editors’ Picks. Let us know if you have any favorites and if there are any products that you think should make the list!

111SKIN Dark Spot Correcting Serum ($350)

Developed by Dr. Yannis and inspired by his treatments and research, this breakthrough serum is clinically proven to reduce the appearance of pigmentation by 36%. It contains a blend of seven alpine plants, Tranexamic Acid, powerhouse antioxidant Glutathione, and effective brightening compound niacinamide, while 111SKIN’s proprietary NAC Y2™ complex repairs and restores skin health.

The Dark Spot Correcting Serum reduces dark spots and hyperpigmentation​ whilst brightening and balancing the complexion for even skin tone and a smoother luminous appearance.​ It helps increase cell turnover and skin renewal for advanced repair.

Baudelaire Apothecary Bath Soak Collection ($12.50-$41)

These sustainably crafted bath soaks combine nature’s finest ingredients, essential minerals, potent vitamins, and lush botanicals to create a transformative bathing experience. The Apothecary soaks transform an everyday bath into a profoundly therapeutic ritual, soothing sore muscles, easing tension, and nourishing skin. Each soak comes packaged in elegant glass jars that evoke a timeless apothecary aesthetic. Includes three categories with different benefits:

  • Calming: Enriched with lavender, chamomile, eucalyptus, and honey to soothe your senses and quiet your mind. Each soak envelops you in serene aromas, transforming your bath into the ultimate relaxation escape.

  • Purifying: Enriched with magnesium, Epsom salts, arnica, and activated charcoal for a deep cleanse that restores vitality. Each soak renews your body and mind, transforming your bath into a revitalizing escape.

  • Replenishing: Enriched with milk, honey, rose oil, and coconut, to deeply nourish your skin and enhance your natural glow. Each soak rejuvenates your body and spirit, transforming your bath into a moment of replenishment.

Black Radiance x Cross Colours Collection ($8-$90)

The latest beauty collaboration between two iconic African American heritage brands, Black Radiance and Cross Colours, this stunning makeup collection captures the spirit of the ‘80s and ‘90s with vibrant colors. The collection includes a cassette tape-inspired eye shadow palette, two volume-boosting mascaras, a multi-use paint palette for face and eye looks, glossy liquid lips in three metallic shades, and creamy ombre-effect lipsticks in three gorgeous hues. Sold individually and as a complete set.

BosleyMD Revive+ Hair Densifying Serum ($20/1-month supply)

BosleyMD Revive+ Hair Densifying Serum represents the next generation of scalp care, powered by AI technology to optimize hair health and a proprietary Y100 compound—a 100% botanical ingredient that re-energizes hair follicles and enhances mitochondrial function. The drug-free, hormone-free formula delivers visible results in just 45 days.

by/ rosie jane Leila Lou Eau de Parfum ($80)

Just in time for spring, this fresh and iconic scent is inspired by spring blooms and effortlessness with notes of juicy pear, sweet jasmine, and fresh cut grass. While Leila Lou has been a cult favorite for over 15 years, the brand is giving it a fresh moment ahead of spring.

Fun fact: Leila Lou was the first fragrance created in the by/ rosie jane collection and is named after founder Rosie’s oldest daughter, Leila Lou. Clean, vegan, and cruelty-free. Available in a travel size, regular size, as well as a set with both sizes.

Cake Beauty The Finishing Touch Pistachio & Salted Caramel Hair and Body Mist ($9.99)

Transport yourself to a tropical getaway and soak up the sun with this delectable hair and body mist. This sunny and sweet fragrance features notes of salted caramel, pistachio cream, jasmine, and vanilla. It’s infused with vitamin E and argan oil for added hydration benefits. Spritz head to toe; can be worn solo or layered for a customized scent.

Clé de Peau Beauté Precious Gold Vitality Serum ($290)

This daily age-defying serum is infused with exclusive 24K Gold Retinol Complex. The smooth, rich texture resists signs of aging caused by stress-related fatigue, leaving skin feeling plumped, firm, and full of revitalized radiance. It also inhibits oxidative damage caused by lifestyle and environmental aggressors, improving the skin barrier and targeting wrinkles, loss of firmness, and lack of luminosity.

[comfort zone] Sublime Skin Collection ($55-$85)

The brand is expanding its Sublime Skin collection with the addition of two new products—the Pro Skin Barrier Cleanser and Precious Glow Drops! These products also include the first cosmetic ingredient to be Regenerative Organic Certified cultivated in Parma at the European Regenerative Organic Center on the property of the Davines Village.

The Pro Skin Barrier Cleanser is a gentle cleansing balm containing Achillea Millefolium oil extract and sweet almond oil with a transformative balm-to-milk texture that effectively removes makeup, pollution, and impurities.

The Precious Glow Drops feature a lightweight, dual-phase blend that combines the nourishing properties of an oil with a silky, non-greasy finish, promoting elasticity, smoothness and, a healthy glow. Formulated with Achillea Millefolium water and oil extract, olive and myrtle leaf extract and baobab oil, it delivers extreme nourishment to the skin.

Credo Body Collection ($34-$52)

An extension of Credo Skincare, Credo Body debuted with three luxe products formulated using an exclusive proprietary fermented kelp. Credo enlisted Maine-based Atlantic Sea Farms to help create the formulation using sugared sea kelp, a type of seaweed known for balancing the microbiome and its ability to penetrate and deeply hydrate skin cells. The lineup includes body cream, body wash, and body serum—each designed to nourish skin and strengthen its barrier. Packaging is 100% PCR PET recyclable bottle and +30% PCR mono material pump.

CYKLAR Perfume Oils ($24 each; $175 for the full collection)

The latest launch from the brand, these perfume oils are available in eight scents, which include several of CYKLAR’s best-selling scents along with some exciting news ones. Applied to pulse points, each fragrance blooms with the warmth of your body—almost as if becoming one with your skin. Scents include:

  • Bergamot Bond

  • Cedar Supreme

  • Flora Veil

  • Lover’s Leather

  • Modern Patchouli

  • Sacred Santal

  • Sex Musk

  • Vanilla Verve

Dermalogica Multivitamin Power Recovery Cream ($95)

Treat dryness, dullness, fine lines, and sagging with this vitamin-rich cream that is packed with an ACE vitamin complex to neutralize free radicals and fortify skin’s barrier, pro-vitamin B5 and niacinamide to soothe dehydration, and freshwater microalgae with astaxanthin to help firm and lift tired skin. ​The powerful blend of skin-repairing vitamins, antioxidants, and peptides work together to restore balance, hydration, and vitality while protecting against future damage.

Dial Men's 2-in-1 Exfoliating Face and Body Wash ($4.17)

Formulated with Dial® Clean Rinse Technology, this men's body wash cleanses deep, gently exfoliates, and rinses away with no filmy residue. It's developed with patented technology to keep you feeling and smelling fresh all day. Dial® men's body washes are free from parabens, phthalates and silicones, leaving skin looking and feeling hydrated and refreshed. 

With a 100% recyclable bottle you can feel good about, try Dial® Men's Gentle Exfoliating 2-in-1 body and face wash for a no-nonsense clean. This package contains 16 fluid ounces of Dial® Men's Gentle Exfoliating 2-in-1 Body and Face Wash.

DESIGNME HOLD.ME Styling Cream ($29)

This multi-tasking styling cream smoothes strands, controls frizz, and protects against heat damage—all in one easy step. It’s infused with nourishing aloe vera and argan oil, adding weightless shine and softness for a polished finish.

Powered by Definicire technology—a 100% natural, clinically tested ingredient—it locks out frizz, shields against humidity, and keeps your style in place all day. Offering a soft natural hold, it’s perfect for frizz-free blowouts and effortlessly sleek styles with heat protection up to 400°F.

Ellis Brooklyn Marshmallows Hair & Body Fragrance Mist ($35-$48)

Experience this playful take on the delicious fun of marshmallows with the elevated vibe of milky musks and vanilla orchid. This gourmand hair and body fragrance mist embraces you in a delicately sweet cloud of inviting yumminess. Vegan, cruelty-free, and sustainable. Tip: Can be layered with Vanilla Sin for a signature delectable scent.

Epicutis Arctigenin Brightening Treatment ($175)

Developed with cutting-edge biotechnology methods, this skin brightening treatment features a unique formulation that ensures the active ingredients are infused deeply into skin in order to maximize their brightening and spot-reducing benefits.

Key ingredients include ferulic acid and vitamin E, Canadian white pine bark extract, Arctigenin extracted from burdock seed oil, DSD (Disodium S-Phytyl Diglycoloylcysteine), and HYVIA (Salvia Hispanica seed oil). The new skin brightening technology called Arctigenin provides a safe and gentle option for sensitive skin, offering a safe and effective alternative to traditional brightening ingredients.

FarmHouse Fresh Cactus Pear Collection ($30-$60)

In celebration of its 20-year anniversary, FarmHouse Fresh has unveiled its new Cactus Collection with products that are infused with the nourishing power of cactus pear. Each product is thoughtfully crafted to offer rapid rejuvenation, a healthy glow, and soothing comfort for every complexion while doing good for animals.

The collection includes a Cactus Comfort Barrier Cream, Cactus CloudSilk Vegan Collagen Multi-Peptide Serum, Cactus Pear Gel Cleanser. A facial set containing all three products along with a vegan leather cosmetic bag is also available.

FlexBeam Portable Red Light Therapy Device ($549)

This wearable red light therapy device stimulates cells to produce more energy and penetrates deep tissue with targeted red and near-infrared light to accelerate recovery and promote natural healing. It includes three sets of -easy-to-use, durable double velcro bands that enable you to use the FlexBeam anywhere on your body, along with a Power Supply with adapters, a hardshell carry case, and a comprehensive 52-page personal guidebook with a wealth of information curated by Dr. Zulia Frost and defined protocols for use.

GUESS Seductive Dream Eau de Toilette ($22.87)

This sensual, enchanting floral fruity amber scent features top notes of Eden apple, pear, and bergamot; middle notes of white gardenia and rose; and base notes of vanilla sugar and amber woods. The scent embodies the captivating and playful GUESS woman, providing a long-lasting signature fragrance. The dreamy pink glass bottle has an abstract floral-patterned label with coordinating gold veining complimented by the iconic GUESS gold logo and hardware.

Imaginary Authors x Salt & Straw Dipped in Chocolate Perfume ($115)

Iconic ice cream brand Salt & Straw has released a new chocolate fragrance made in collaboration with perfume brand Imaginary Authors. It features delectable notes of chocolate, cardamom, vanilla cream, sandalwood, Benzoin Sumatra, and a whiff of waffle cone. The perfume can be purchased at all of Salt & Straw’s scoop shops as well as online.

INNBEAUTY Project Calm the Red Down ($54)

This potent serum delivers the ultimate solution for redness and blotchiness with two formulas in one product. Designed to seamlessly fit into any morning or evening routine, this dual-chamber treatment provides instant redness correction and long-term results.

The first formula targets the root causes of redness including inflammation, hot flushed skin, histamine response, and a compromised skin barrier. The second formula instantly neutralizes redness, blotchiness, and uneven skin tone. The weightless formula blends effortlessly into the skin for a natural, even finish—no heavy coverage required!

Jaya Organics Reed Diffusers ($19 each)

This brand-new home collection from hotel luxury amenity brand Jaya Organics from Jaya House River Park in Cambodia features a new line of reed diffusers in addition to a luxury candle based on guests’ favorite scents. The new reed diffuser scents are available in Jasmine, Kraob (cinnamon, vanilla, and sandalwood), and Lemongrass.

Beauty Boss: Dennis Reinhard, Founder of Jaya Organics

Made from high-quality essential oil from Cambodia, the diffuser gently releases a pleasant aroma that creates an inviting and sophisticated atmosphere. The reeds effortlessly diffuse the fragrance, leaving a lingering scent that lasts 10 to 12 weeks. Vegan, free from phthalates, paraben, and artificial colorants.

The luxury candle is available in the Kraob scent and is inspired by the sweet aroma of Cambodian cinnamon, vanilla, and sandalwood. It’s a perfect blend of warm and complex fragrances that create a soothing and relaxing ambiance in any space. The candle comes in a beautiful ceramic made by local artisans. Burns for 50 to 60 hours, is made with soy wax, and is 100% vegan.

Kat Burki Bio-Ferment Scalp & Hair Treatment ($90)

Kat Burki has debuted her first haircare product featuring a groundbreaking formula that is designed to tackle hair loss prevention and support regrowth. The biochemistry-backed scalp serum targets all three phases of the hair growth lifecycle, enhancing blood flow and nutrient delivery to follicles to promote regrowth, improve hair structure and volume, and rejuvenate existing strands and anchor them to the scalp to reduce shedding. Includes Larix Europaea Wood Extract, Fermented Macronutrients, copper peptides, and Pro B vitamins.

Kosterina Extra Virgin Body Soap ($10)

Featuring the brand’s signature extra virgin olive oil from Greece, this luxurious handmade soap leaves skin feeling clean, smooth, and nourished. It’s made with clean ingredients and is free of parabens, phtalates, petroleum, sulfates, and synthetic fragrances. Enjoy the subtle scent of fresh lemon and lavender that will instantly transport you to the Mediterranean seaside!

LoveShackFancy Mini Forever In Love & Endless Dreams Eau de Parfum Set ($39)

Discover your new signature perfume with the must-have mini duo of Forever in Love and Endless Dreams. Forever in Love is the ultimate fruity floral; a swoon-worthy perfume with green pear and gardenia. Endless Dreams is a warm, overflowing floral garden with strawberry, jasmine, and Tahitian vanilla. Comes in adorable mini LoveShackFancy perfume bottles top with pretty bows!

Mita Eyewear Capri Full Coverage Sunglasses in Beige ($139)

Inspired by Miami’s fashion-forward trends, these sunglasses are sophisticated and earth-friendly, made from recycled water bottles with gradient lenses and the brand’s signature Mita “I” detail on the temples. The oversized Italian designer shades are available in chic black, tortoise shell, gray, and beige (pictured).

MIXIK SKIN Gumball Lips Collection ($22 each)

Popular K-beauty brand MIXIK SKIN, known for its innovative all-mist skincare products, has launched its first-ever Gumball Lips Collection featuring Plumping Lip Ampoules, Juicy Lip Tints, and Glossy Lip Serums. Products are infused with blue agave extract, a powerhouse ingredient that deeply hydrates lips, leaving them soft, smooth and glowing.

The Plumping Lip Ampoules enhance a fuller pout with intense hydration, Juicy Lip Tints lend a burst of buildable color that hydrates lips and can also be used as blush, and the Glossy Lip Serum is a non-sticky gloss that nourishes and shines. Available in multiple fun shades and can be layered together for a variety of looks!

Necessaire The Lip Balm ($25)

The Lip Balm is instant relief for dry, chapped or compromised lips. Essential ceramides, niacinamide, hyaluronic acid, Omega 6 and 9, and Centella Asiatica Extract are compounded into a proprietary complex delivered in shea butter to help repair dryness and soothe chapped lips.

Pure essential mint oil delivers a hint of fresh, while the tip cools on contact for the best in sensory. Clear, semi-gloss finish. Dermatologist-tested. Hypoallergenic. Non-comedogenic. Vegan.

Nimbi Shaving Products ($10 each)

This new line has everything you need to enjoy a smooth, long-lasting shave. Designed by women, for women—their solid shaving foam with shea butter and plastic-free disposable razors can be used on the body, pubic area, underarms, legs, and for upper lip hair removable. Optimized for sensitive skin, coarse, and curly hair types. We also love the ultra-minimal aesthetic of the brand!

NOYZ The Solid Fragrance ($42/$32 Refill)

This silky, balm-like formula glides and melts with the warmth of skin to release a concentrated yet intimate scent that moves with you throughout the day. It comes in a refillable, snappable case so that you can sustainably switch up your fragrance. Available in all five genderless, layerable NOYZ scents: 12:00, Lost + Found, Love Club, SH**ty Day, and Unmute.

Odacite Retinol Therapy Renewing Hand Cream PHA + Peptides ($45)

Improve the look and feel of hands with this advanced hand treatment that pairs the regenerating power of retinol and retinoid with Polyhydroxy Acid (PHA), peptides, and niacinamide to improve dryness and signs of aging, in addition to thinning skin, dark spots, and damaged cuticles. It’s enrich with a restorative complex of hyaluronic acid, avocado oil, oatmeal, and botanical butters—it feels like a nourishing glove that renews skin’s appearance overnight. Every purchase includes a free pair of moisture sleep gloves.

OSEA Dream Night Serum ($88)

This powerful formula works while you sleep to visibly reduce crow’s feet, fine lines, and deeper wrinkles. Algae-derived bio-retinol, red seaweed, hydrolyzed hyaluronic acid, and two firming peptides (Tripeptide + Tetrapeptide technology) combine to mimic the effects of retinol without irritation. Skin will look visibly smoother and firmer as a result!

OUAI Wave Spray ($30)

Introducing the new and improved version of OUAI Wave Spray featuring a salt-free formula to achieve the ultimate beachy hair. Infused with rice protein, this spray adds hold and memory to waves without that crunchy or stiff feeling. The gentle formula adds body and natural volume to enhance your natural or styled waves. Features the brand’s signature North Bondi scent, a dreamy blend of bergamot, rose, and white musk that transports you straight to paradise with every spritz.

Phlur Golden Rule Eau de Parfum ($29-$99)

This all-new scent embodies modern femininity with bold mandarin, pepper, jasmine, orange flower, coconut milk, and vanilla cream. The warm, energetic floral is made for your golden era. Layers well with Father Figure Eau de Parfum.

Saltair Multi-Lipid Body Butters ($20)

This collection of skin lipid-replenishing body butters contains a ceramide complex, phospholipids, fatty acids, and phytosterols to nourish and restore skin. Coconut and sea buckthorn oils help to lock in moisture for a healthier-looking skin barrier. Available in five of the brand’s signature scents including Exotic Pulp, Golden Hour, Pink Beach, Salt Water & Vanille, and Santal Bloom. Vegan, cruelty-free, paraben-free, and gluten-free.

Saltair Salt Water Vanilla Collection ($10-$22)

The brand introduces its newest scent, Salt Water Vanilla— a warm and enveloping, yet comfortable and sweet scent that melds delectable sweetness with an edge of salt breeze. featuring notes of vanilla flower, creamy sandalwood, and sea salt, the scent is simply irresistible. It’s available in Saltair’s best-selling products including a deodorant, body wash, body lotion, 5% aha serum deodorant, nourishing body oil, and multi-lipid body butter. Vegan, cruelty-free, paraben-free, and gluten-free.

S’Eau Prima Foundational Face Mist ($48)

This gentle yet powerful face mist featuring hypochlorous acid and Bora Bora sea salt helps improve skin’s moisture barrier, purifying and soothing the dermis while providing protection against environmental stressors. It balances skin’s pH level, boosting skin’s overall appearance, and maximizes the efficacy of other skincare products. The sea salt helps to soften, firm, and draw moisture to skin to promote healthy cell activity and aid absorption of impurities and excess sebum.

Skylar Nude Skin ($30-$90)

This fragrance wraps you in a radiant blend of tiger orchid, warm vanilla, and golden amber—an irresistible fragrance that feels like the softest silk on bare skin. Both comforting and unforgettable, it’s Skylar’s most intimate scent yet. Available in both a regular size and rollerball. Features the following notes:

  • Top: Pineapple Splash, Papaya Smoothie, Starfruit

  • Middle: Tiger Orchid, Coconut Blossom, Frangipani

  • Base: Warm Vanilla, Golden Amber, Upcycled Cedar

SLICKHAIR Slick Stick ($20)

Prevent flyaways and keep hairstyles polished in order with the Slick Stick hair wand, a serum-based anti-flyaway formula specially designed to provide all-day hold without greasiness or stiffness. The cruelty-free and vegan-friendly wand is suitable for all hair types, making it easy to create sleek ponytails, buns, and other styles without the need for hairspray or bobby pins

Can also be paired with the Wax Stick, which provides extra strong hold all day without flakiness and greasiness. It’s refined with nutrient-rich beeswax and candelilla wax to moisturize hair while keeping it in place. Natural castor seed oil conditions and nourishes while sunflower seed oil promotes overall scalp and hair health.

Snif Me ($65)

Smell like the best version of yourself with this shape-shifting formula that blends orris and musk with plum and peach skin. The scent reflects your skin’s unique chemistry, starting with a hint of plum, peach skin, and white moss before settling into a blend of orris, sandalwood and musks. Vegan, cruelty-free, and paraben-free.

Thisworks Deep Sleep Beauty Oil ($65)

This advanced anti-aging face and body oil helps support better sleep and is clinically proven to improve skin elasticity. It’s formulated with a superblend of high-performance botanical oils and skincare actives to help support skin barrier integrity and improve skin elasticity. Plant-derived bakuchiol helps reduce the appearance of fine lines and wrinkles, and is expertly blended with Sesquiterpenes and Deep Sleep Functional Fragrance for better sleep.

Topical Skin Age-Defying Peptide Serum ($125)

This lightweight rejuvenating serum helps improve the appearance of signs of aging and reveals a more youthful complexion. It’s enhance with moisture-locking Oloesome technology, absorbing quickly and layering easily. It also features a comprehensive blend of peptides, vitamins, and botanicals that help ward off pro-aging glycation effects, soothe skin, and deliver a collagen-rich appearance to skin.

Touchland Power Essence Body & Hair Fragrant Mist ($20 each)

For the first time ever, Touchland (known for its hydrating mist hand sanitizers) has expanded into the fragrance category with skincare-infused fragrances enriched with hyaluronic acid, niacinamide, and panthenol—skin and hair are hydrated, refreshed, and smooth as a result. The lightweight formula features a cruelty-free formulation and travel-friendly packaging, and is available in eight captivating scents that are designed to enhance your mood.

Typology T41 Replenishing Tinted Lip Balm ($39.90)

Enriched with hyaluronic acid and ceramides, this balm provides 8-hour hydration for soft, supple lips. Multi-purpose for lips and cheeks. Luminous finish with buildable coverage. 98% naturally derived. Refillable. Available in three gorgeous colors and a clear balm.

Vacation Classic Whip Glow SPF 30 ($23)

This lightweight, dessert-inspired sunscreen delivers a luminous and radiant glow to skin. The foam-whipped gold shimmer offers Broad Spectrum SPF 30 protection, is water resistant (up to 80 minutes), dermatologist tested, cruelty-free, vegan, PEG and paraben-free, Oxybenzone and Octinoxate-free, and safe for sensitive skin. It features Vacation’s award-winning signature scent with notes of banana, coconut, pool water, pool toy, and swimsuit lycra.

Valentino Beauty Born in Roma Donna Extradose Le Parfum ($38-$198)

This fragrance for women is a feminine scent inspired by night in the eternal city. Featuring key notes of Cassis Accord, Rhum Accord, and vanilla extract, the floral ambery fragrance delves into an intense experience with the highest concentration.

Paying tribute to the iconic Valentino Rockstud, Donna Extradose presents an edgy pyramidal design, inspired by Roman architecture and the house signature of Maison Valentino. Available in multiple sizes ranging from travel to extra large.

Valentino Beauty Colorgraph Eyeliner ($38)

This dual-ended gel eyeliner combines a pencil tip with a soft blending brush to glide graphic lines for a sharp eyeliner look or blend the texture into a smokey liner look. Blend, smudge or wing before the color firmly locks down and lasts all-day without smudging. Waterproof and ultra-rich color. Available in six gorgeous shades (pictured: Blue Niagara).

Valmont Vitality Collection ($210-$285)

Valmont’s new Vitality Collection revitalizes skin and pushes back the boundaries of DNA discovery with cutting-edge, science-backed innovation featuring its latest groundbreaking skincare ingredient: Silanol DNA. This revolutionary active ingredient boosts three key cellular mechanisms: respiration amplification, triple regeneration and protection reinforcement for an efficacious and global response to the signs of aging. The collection includes a revitalizing face serum, eye cream, face fluid, face cream, fine revitalizing face cream, and a rich revitalizing face cream.

[Photos courtesy of brands]

Kamala Kirk is a University of Southern California graduate and has been an editor/writer for more than a decade. She has written for E! Online, Total Beauty, TravelAge West, Malibu Times Magazine, and many more. She resides in Los Angeles and is a proud pug mom. Follow her on Instagram: @kamalakirk