20 Best Biotin Hair Skin And Nails Results [2024]

Are you looking for the best biotin hair skin and nails results? Based on expert reviews, we ranked them. We've listed our top-ranked picks, including the top-selling biotin hair skin and nails results.

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# Preview Product
1 Nature's Bounty Vitamin Biotin Optimal Solutions Hair, Skin and Nails Gummies, 200 Count Nature's Bounty Vitamin Biotin Optimal Solutions Hair, Skin and Nails Gummies, 200 Count
2 Powerful Hair Plus, Unique Hair Vitamins with Biotin For Hair, Skin & Nails, Addresses Vitamin... Powerful Hair Plus, Unique Hair Vitamins with Biotin For Hair, Skin & Nails, Addresses Vitamin...
3 Liquid Biotin & Collagen Hair Growth Drops 50,000mcg – Biotin and Liquid Collagen Supplements for... Liquid Biotin & Collagen Hair Growth Drops 50,000mcg – Biotin and Liquid Collagen Supplements...
4 Nature's Bounty Hair, Skin & Nails with Biotin and Collagen, Citrus-Flavored Gummies Vitamin... Nature's Bounty Hair, Skin & Nails with Biotin and Collagen, Citrus-Flavored Gummies Vitamin...
5 Nature's Bounty Optimal Solutions Advanced Hair, Skin & Nails Jelly Beans with Biotin, Mixed Fruit... Nature's Bounty Optimal Solutions Advanced Hair, Skin & Nails Jelly Beans with Biotin, Mixed...
6 Nature's Bounty Biotin, Supports Healthy Hair, Skin and Nails, 10000 mcg, Rapid Release Softgels,... Nature's Bounty Biotin, Supports Healthy Hair, Skin and Nails, 10000 mcg, Rapid Release Softgels,...
7 Hair Skin and Nails Vitamins | 300 Softgels | with Biotin and Collagen | Infused with Argan Oil and... Hair Skin and Nails Vitamins | 300 Softgels | with Biotin and Collagen | Infused with Argan Oil...
8 Sports Research Extra Strength Vegan Biotin (Vitamin B) Supplement with Organic Coconut Oil -... Sports Research Extra Strength Vegan Biotin (Vitamin B) Supplement with Organic Coconut Oil -...
9 Pure Rosemary Essential Oil with Dropper - Undiluted Rosemary Oil for Hair Skin and Nails and... Pure Rosemary Essential Oil with Dropper - Undiluted Rosemary Oil for Hair Skin and Nails and...
10 Nature's Bounty Extra Strength Hair Skin Nails, 5000mcg of Biotin (250 Count) Nature's Bounty Extra Strength Hair Skin Nails, 5000mcg of Biotin (250 Count)
11 Sports Research Biotin Supplement with Organic Coconut Oil, 5,000mcg, 120 Veggie Softgel Caps Sports Research Biotin Supplement with Organic Coconut Oil, 5,000mcg, 120 Veggie Softgel Caps
12 Amazon Elements Vegan Biotin 5000 mcg - Hair, Skin, Nails - 130 Capsules (4 month supply) (Packaging... Amazon Elements Vegan Biotin 5000 mcg - Hair, Skin, Nails - 130 Capsules (4 month supply)...
13 Nature Made Hair Skin and Nails with Biotin 2500 mcg, Dietary Supplement For Healthy Hair Skin and... Nature Made Hair Skin and Nails with Biotin 2500 mcg, Dietary Supplement For Healthy Hair Skin...
14 Mane 'n Tail Moisturizer Texturizer Conditioner for Thicker Healthier Looking Hair and Coats Gallon Mane 'n Tail Moisturizer Texturizer Conditioner for Thicker Healthier Looking Hair and Coats Gallon
15 New Chapter Biotin Supplement, Vegan Hair Skin and Nails Vitamins with Fermented Biotin +... New Chapter Biotin Supplement, Vegan Hair Skin and Nails Vitamins with Fermented Biotin +...
16 Nature's Bounty Hair, Skin & Nails Rapid Release Softgels, Argan-Infused Vitamin Supplement with... Nature's Bounty Hair, Skin & Nails Rapid Release Softgels, Argan-Infused Vitamin Supplement with...
17 Nature's Bounty Optimal Solutions Advanced Hair, Skin & Nails Gummies, Strawberry, 200 Count Nature's Bounty Optimal Solutions Advanced Hair, Skin & Nails Gummies, Strawberry, 200 Count
18 Biotin Gummies 10000mcg [Highest Potency] for Healthy Hair, Skin & Nails Vitamins for Women, Men &... Biotin Gummies 10000mcg [Highest Potency] for Healthy Hair, Skin & Nails Vitamins for Women, Men...
19 Nutrafol Women’s Balance Menopause Supplement, Clinically Proven Hair Growth Supplement for... Nutrafol Women’s Balance Menopause Supplement, Clinically Proven Hair Growth Supplement for...
20 Nature's Bounty Optimal Solutions Hair, Skin & Nails Formula, 60 Coated Caplets Nature's Bounty Optimal Solutions Hair, Skin & Nails Formula, 60 Coated Caplets
SaleBestseller No. 1
Nature's Bounty Vitamin Biotin Optimal Solutions Hair, Skin and Nails Gummies, 200 Count
  • SUPPORTS BEAUTIFUL HAIR GLOWING SKIN AND HEALTHY NAILS: Delicious strawberry-flavored gummies contain biotin; vitamins; minerals; antioxidants and...
  • WITH BEAUTY-SUPPORTING BIOTIN (2): Nature's Bounty Hair Skin & Nails Gummies contain beauty-supporting biotin which is a vital nutrient that helps to...
  • HELPS MAINTAINS HEALTHY SKIN:(2) Vitamin E contributes to skin health and Vitamin C is involved in collagen production and formation which forms the...
  • DELICIOUS STRAWBERRY FLAVORED GUMMIES: Delicious strawberry-flavored gummies are laboratory tested and contain no milk; no lactose; no soy; no gluten;...
  • FROM THE TRUSTED WELLNESS EXPERTS: Nature’s Bounty Hair Skin & Nail Gummies are a product of nearly 50 years of dedication to quality consistency...
Bestseller No. 2
Powerful Hair Plus, Unique Hair Vitamins with Biotin For Hair, Skin & Nails, Addresses Vitamin...
  • POWERFUL HAIR, SKIN & NAILS SUPPORT: Uniquely manufactured from the ground up for the best possible results. Stop wasting your money on junk; healthy...
  • UNIQUE INGREDIENTS PROVIDE EXTRAORDINARY BENEFITS: Packed with natural ingredients, everything from Biotin, MSM, Saw Palmetto to Fo Ti and more. Our...
  • ADDRESS THE ROOT OF THE PROBLEM: Powerful Hair Plus addresses potential vitamin deficiencies that may cause hair loss and lack of hair growth /...
  • MADE IN THE USA -- GMP APPROVED FACILITY: Not all hair supplements, dht blockers or hair growth pills are made equal which is why we made sure...
  • GUARANTEED SATISFACTION OR YOUR MONEY BACK: We strongly recommend a 3 month supply. Your order will include a 90 day money back guarantee. Try it for...
SaleBestseller No. 3
Liquid Biotin & Collagen Hair Growth Drops 50,000mcg – Biotin and Liquid Collagen Supplements for...
  • High Potency Support for Hair, Skin, & Nails - Our liquid Biotin and Collagen contains a high potency of biotin and collagen to support hair growth,...
  • Biotin is Essential For Support of Healthier Hair & Nails - Men & women can benefit from healthy hair and skin support with our liquid Biotin...
  • Rich and Smooth Flavor - Berry flavor Biotin Collagen liquid goes down smooth and tastes great! our biotin Collagen supplement is a delicious,...
  • B-Complex Family - Biotin is a co-enzyme and one of several B vitamins that support healthy body functions such as metabolism. Nourish your skin and...
  • A Brand You Can Trust - We are proud of the quality & purity of every bottle of Biotin we sell. But if for some reason we do not meet your...
SaleBestseller No. 4
Nature's Bounty Hair, Skin & Nails with Biotin and Collagen, Citrus-Flavored Gummies Vitamin...
  • NUMBER 1 BRAND FOR HAIR SKIN AND NAILS (1) With over 50 years of making quality vitamins and more than 20 years in the beauty business you can trust...
  • SUPPORTS BEAUTIFUL HAIR, GLOWING SKIN, AND HEALTHY NAILS (2) Delicious tropical citrus flavored gummies contain biotin; collagen; vitamins; minerals;...
  • WITH BIOTIN AND COLLAGEN Nature's Bounty Hair Skin & Nails plus Collagen Gummies contain beauty-supporting biotin; a vital nutrient that helps to...
  • HELPS MAINTAIN HEALTHY SKIN (2) Vitamin E contributes to skin health and Vitamin C is involved in collagen production and formation which forms the...
  • DELICIOUS TROPICAL CITRUS FLAVORED GUMMIES Delicious tropical citrus gummies are laboratory tested and contain no milk; no lactose; no soy; no gluten;...
SaleBestseller No. 5
Nature's Bounty Optimal Solutions Advanced Hair, Skin & Nails Jelly Beans with Biotin, Mixed Fruit...
  • One 180 count bottle of Nature's Bounty Optimal Solutions Advanced Hair, Skin & Nails Jelly Beans
  • Jelly Bean vitamins include added Keratin, as well as Vitamin A, Vitamin C and Vitamin E
  • Non-GMO, vegetarian Biotin vitamins with no artificial flavor or sweetener
  • A great addition to your shelf of skin care products, with essential vitamins to support beauty from the inside (1)
  • Jelly Bean Biotin supplement in mixed berry, strawberry, and watermelon flavors
SaleBestseller No. 6
Nature's Bounty Biotin, Supports Healthy Hair, Skin and Nails, 10000 mcg, Rapid Release Softgels,...
  • SUPPORTS HEALTHY HAIR (1): As is a commonly used vitamin for healthy hair Biotin helps support and maintain healthy beautiful hair (1)
  • SKIN & NAIL HEALTH SUPPORT (1): Biotin plays an important role in the health of your skin and also supports healthy nails so you can continue to look...
  • NERVOUS SYSTEM SUPPORT (1): As part of the B Family of vitamins Biotin helps support a healthy nervous system and has other benefits as well (1)
  • ENERGY METABOLISM: Your body uses B-Vitamins, like Biotin to help convert foods into cellular energy; (1) Nature’s Bounty Biotin vitamins may play...
  • FROM THE TRUSTED WELLNESS EXPERTS: Nature’s Bounty Biotin Softgels are a product of nearly 50 years of dedication to quality consistency and...
SaleBestseller No. 7
Hair Skin and Nails Vitamins | 300 Softgels | with Biotin and Collagen | Infused with Argan Oil and...
  • BEAUTY INFUSED: Advanced Hair, Skin and Nails supplement featuring Argan Oil & Hydrolyzed Collagen!
  • OPTIMAL ABSORPTION: Horbaach's Max Strength quick release softgels are super concentrated
  • YOUTHFUL FORMULA: Our Clean Beauty formula is enriched with potent Vitamins, Minerals and Nutrients
  • HORBAACH MANUFACTURERS: Laboratory Tested, Trusted Ingredients, Superior Quality, 100% Guaranteed!
  • NATURALLY FREE OF: Gluten, Wheat, Yeast, Milk, Lactose, Artificial Flavoring & NON-GMO
SaleBestseller No. 8
Sports Research Extra Strength Vegan Biotin (Vitamin B) Supplement with Organic Coconut Oil -...
  • VITAMIN B7: Biotin, also known as vitamin B7, is an essential micronutrient involved in Keratin synthesis. Our Biotin vitamins support your hair and...
  • HEALTHY HAIR AND NAILS: Our Biotin 10,000 mcg soft gels support keratin synthesis to support your hair and nails - especially if you are not getting...
  • PREMIUM QUALITY: Sports Research is proud to offer products using only the best ingredients available so that you can have total peace of mind in the...
  • MANUFACTURED IN THE USA: Our Biotin is carefully manufactured in cGMP compliant facilities and third party quality tested right here in the USA. We...
  • THE SPORTS RESEARCH DIFFERENCE: Created in 1980, Sports Research is a privately-owned business born from a passion for fitness, wellness, and healing....
Bestseller No. 9
Pure Rosemary Essential Oil with Dropper - Undiluted Rosemary Oil for Hair Skin and Nails and...
  • Essential Oil Rosemary - Rosemary is one of the most prolific aromatherapy essential oils for diffuser and beauty care offering many benefits as one...
  • Rosemary Hair Oil - Healthy hair starts at the scalp so try our rosemary oil for hair and dry scalp care that can be added to your favorite shampoo or...
  • Skin Care Oil - Dilute our pure rosemary oil for skin with your favorite carrier oil to cleanse and refresh dull dry skin acting as a natural anti...
  • Other Benefits - Try rosemary oil diffuser essential oils for humidifiers and diffusers touted for its relaxing benefits that may promote attentive...
  • Maple Holistics Quality - We are a trusted name in aromatherapy essential oils and our pure essential oils won’t disappoint because we source only...
SaleBestseller No. 10
Nature's Bounty Extra Strength Hair Skin Nails, 5000mcg of Biotin (250 Count)
  • Supports Lustrous Hair, Healthy Nails & Vibrant Skin
  • Argan Oil Infused plus Hyaluronic Acid
  • Antioxidants Vitamin C & E
  • No Artificial Flavors and Gluten Free
SaleBestseller No. 11
Sports Research Biotin Supplement with Organic Coconut Oil, 5,000mcg, 120 Veggie Softgel Caps
  • POTENT AND POWERFUL: Biotin, also known as vitamin B7, is an essential micronutrient involved in Keratin synthesis. Our Biotin vitamins support your...
  • HEALTHY HAIR AND SKIN: Our Biotin 5,000 mcg soft gels support keratin synthesis to support your hair and skin - especially if you are not getting the...
  • PREMIUM QUALITY: Sports Research is proud to offer products using only the best ingredients available so that you can have total peace of mind in the...
  • Our products are made in cGMP compliant facilities in the United States, using only the best ingredients from domestic & international origins. For...
  • THE SPORTS RESEARCH DIFFERENCE: Created in 1980, Sports Research is a privately-owned business born from a passion for fitness, wellness, and healing....
SaleBestseller No. 12
Amazon Elements Vegan Biotin 5000 mcg - Hair, Skin, Nails - 130 Capsules (4 month supply) (Packaging...
  • 130 capsules, a 4 month supply (taken daily at the listed serving size)
  • Helps maintain normal hair, skin, and nails. Supports normal brain function and cognition. Supports normal energy metabolism
  • No artificial colors, flavors or chemical preservatives; vegan; gluten free
  • Product of China; blended and packaged in USA
  • Made in a Good Manufacturing Practices (GMP) facility in the USA
SaleBestseller No. 13
Nature Made Hair Skin and Nails with Biotin 2500 mcg, Dietary Supplement For Healthy Hair Skin and...
  • Healthy hair, skin, nail support supplement: contains one 120 count bottle of Nature Made Hair Skin and Nails with Biotin 2500 mcg Softgels for a...
  • Each Nature Made Biotin 2500 mcg softgel supports hair health, skin health, and healthy nails for those low in Biotin
  • This Nature Made Hair Skin and Nails Biotin supplement also supports energy metabolism
  • Adults, take one softgel daily with water and a meal
  • These gluten free Biotin softgels are made from carefully selected ingredients and have no synthetic dyes and no artificial flavors
Bestseller No. 14
Mane 'n Tail Moisturizer Texturizer Conditioner for Thicker Healthier Looking Hair and Coats Gallon
  • Nourishes and conditions hair and skin to aid healthy hair growth leaving a lustrous, silky look
  • Exclusive protein enriched amino acid formula with unique properties that condition and strengthens, preventing hair breakageMoisturizes to help...
SaleBestseller No. 15
New Chapter Biotin Supplement, Vegan Hair Skin and Nails Vitamins with Fermented Biotin +...
  • EASILY DIGESTIBLE BIOTIN: Vegan beauty supplement is masterfully formulated with fermented Biotin and beauty herbs to revitalize from within. NOW...
  • PROTECTS COLLAGEN & SKIN ELASTICITY: Noticeable skin results in just 6 weeks with clinically proven ASTAXANTHIN—a rare plant-nutrient from organic...
  • HAIR SKIN AND NAILS VITAMINS: Nourish healthy hair & build strong nails with Fermented Biotin to promote your body’s natural production of keratin*
  • HOLISTIC BEAUTY with added SUPERFOOD blends to support stress, energy and digestion—key areas that can affect skin health*
  • Made with Certified Organic Algae, Non-GMO Project Verified, Certified Kosher, Certified Gluten Free by NSF, 100% Vegetarian, Certified Vegan, No...
SaleBestseller No. 16
Nature's Bounty Hair, Skin & Nails Rapid Release Softgels, Argan-Infused Vitamin Supplement with...
  • SUPPORTS BEAUTIFUL HAIR, GLOWING SKIN, AND HEALTHY NAILS: Hair, Skin & Nails Rapid Release Softgels contain biotin, vitamins, minerals, antioxidants...
  • WITH BEAUTY-SUPPORTING BIOTIN: Nature's Bounty Hair, Skin & Nails vitamins contain beauty-supporting biotin, a vital nutrient that helps to maintain...
  • ANTIOIXIDENTS PLUS HYALURONIC ACID: Skin & Hair Nutrients Antioxidants A, C & E Plus Hyaluronic Acid. Laboratory tested and contains no artificial...
  • HELPS MAINTAINS HEALTHY SKIN: Vitamin E contributes to skin health (2), and Vitamin C is involved in collagen production and formation, which forms...
  • FROM THE TRUSTED WELLNESS EXPERTS: Nature’s Bounty Extra Strength Hair Skin and Nails Vitamins are a product of nearly 50 years of dedication to...
SaleBestseller No. 17
Nature's Bounty Optimal Solutions Advanced Hair, Skin & Nails Gummies, Strawberry, 200 Count
  • Product Note: Exposure to heat or sunlight may lead to melting/damage of product. Hence customers are expected to be available during the product...
SaleBestseller No. 18
Biotin Gummies 10000mcg [Highest Potency] for Healthy Hair, Skin & Nails Vitamins for Women, Men &...
  • Effective & Easy - With 10,000 mcg of pure biotin in each serving, NutraChamps’ Biotin Gummies deliver the highest potency and most effective dose...
  • Great Taste, Great Benefits - These convenient and delicious gummies are fantastic — just like your hair, skin and nails will look after just a...
  • Healthier Hair, Skin & Nails - Caring for your hair, skin and nails is not just about what kind of products you use on the outside, but also about...
  • Vegan & Plant-Based Gummies - When deciding on a Biotin option, go vegan with NutraChamps. These gummies were designed to offer the best and leave out...
  • Biotin Chewables - Perfect biotin gummies for hair and nail growth supplement for on-the-go! Now biotin is easy to add to your daily routine! Hair and...
Bestseller No. 19
Nutrafol Women’s Balance Menopause Supplement, Clinically Proven Hair Growth Supplement for...
  • NATURAL HAIR GROWTH: 4 capsules per day of this clinically effective hair supplement promotes visibly thicker hair growth and more scalp coverage...
  • SUPPORTS HORMONE HEALTH: Improves hair growth by targeting root causes of thinning hair for women in peri- and postmenopause–like hormone shifts and...
  • CLINICALLY PROVEN TO IMPROVE HAIR GROWTH: 100% of women showed improved hair growth after 9 months, 93% saw less dryness and brittleness, and 93% felt...
  • THE #1 DERMATOLOGIST-RECOMMENDED HAIR GROWTH SUPPLEMENT BRAND*: Grow with the brand trusted by leading dermatologists to improve hair growth...
  • AWARD-WINNING FORMULA: Winner of the Best Anti-Aging Hair Supplement of 2021 Award from Harper’s Bazaar.
SaleBestseller No. 20
Nature's Bounty Optimal Solutions Hair, Skin & Nails Formula, 60 Coated Caplets
  • SUPPORTS BEAUTIFUL HAIR, GLOWING SKIN, AND HEALTHY NAILS: Hair, Skin and Nails Coated Caplets contain biotin, vitamins, minerals, antioxidants and...
  • Product Note: Exposure to heat or sunlight may lead to melting/damage of product. Hence customers are expected to be available during the product...
  • WITH BEAUTY-SUPPORTING BIOTIN: Nature's Bounty Hair, Skin and Nails vitamins contain beauty-supporting biotin, a vital nutrient that helps to maintain...
  • 16 KEY INGREDIENTS: Includes 16 Key Ingredients including antioxidents. laboratory tested and contains no artificial color or flavor, and are free...
  • HELPS MAINTAINS HEALTHY SKIN: Vitamin E contributes to skin health, and Vitamin C is involved in collagen production and formation, which forms the...

Having trouble finding a great biotin hair skin and nails results?

This problem is well understood by us because we have gone through the entire biotin hair skin and nails results research process ourselves, which is why we have put together a comprehensive list of the best biotin hair skin and nails resultss available in the market today.

After hours of searching and using all the models on the market, we have found the best biotin hair skin and nails results for 2023. See our ranking below!

How Do You Buy The Best Biotin Hair Skin And Nails Results?

Do you get stressed out thinking about shopping for a great biotin hair skin and nails results? Do doubts keep creeping into your mind?

We understand, because we’ve already gone through the whole process of researching biotin hair skin and nails results, which is why we have assembled a comprehensive list of the greatest biotin hair skin and nails results available in the current market. We’ve also come up with a list of questions that you probably have yourself.

John Harvards has done the best we can with our thoughts and recommendations, but it’s still crucial that you do thorough research on your own for biotin hair skin and nails results that you consider buying. Your questions might include the following:

  • Is it worth buying an biotin hair skin and nails results?
  • What benefits are there with buying an biotin hair skin and nails results?
  • What factors deserve consideration when shopping for an effective biotin hair skin and nails results?
  • Why is it crucial to invest in any biotin hair skin and nails results, much less the best one?
  • Which biotin hair skin and nails results are good in the current market?
  • Where can you find information like this about biotin hair skin and nails results?

We’re convinced that you likely have far more questions than just these regarding biotin hair skin and nails results, and the only real way to satisfy your need for knowledge is to get information from as many reputable online sources as you possibly can.

Potential sources can include buying guides for biotin hair skin and nails results, rating websites, word-of-mouth testimonials, online forums, and product reviews. Thorough and mindful research is crucial to making sure you get your hands on the best-possible biotin hair skin and nails results. Make sure that you are only using trustworthy and credible websites and sources.

John Harvards provides an biotin hair skin and nails results buying guide, and the information is totally objective and authentic. We employ both AI and big data in proofreading the collected information.

How did we create this buying guide? We did it using a custom-created selection of algorithms that lets us manifest a top-10 list of the best available biotin hair skin and nails results currently available on the market.

This technology we use to assemble our list depends on a variety of factors, including but not limited to the following:

  1. Brand Value: Every brand of biotin hair skin and nails results has a value all its own. Most brands offer some sort of unique selling proposition that’s supposed to bring something different to the table than their competitors.
  2. Features: What bells and whistles matter for an biotin hair skin and nails results?
  3. Specifications: How powerful they are can be measured.
  4. Product Value: This simply is how much bang for the buck you get from your biotin hair skin and nails results.
  5. Customer Ratings: Number ratings grade biotin hair skin and nails results objectively.
  6. Customer Reviews: Closely related to ratings, these paragraphs give you first-hand and detailed information from real-world users about their biotin hair skin and nails results.
  7. Product Quality: You don’t always get what you pay for with an biotin hair skin and nails results, sometimes less, and sometimes more.
  8. Product Reliability: How sturdy and durable an biotin hair skin and nails results is should be an indication of how long it will work out for you.

John Harvards always remembers that maintaining biotin hair skin and nails results information to stay current is a top priority, which is why we are constantly updating our websites. Learn more about us using online sources.

If you think that anything we present here regarding biotin hair skin and nails results is irrelevant, incorrect, misleading, or erroneous, then please let us know promptly!

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FAQ:

Q: Does biotin work reviews?

A: Curious about whether biotin shampoos actually work, we reached out to a couple dermatologists for their hot takes. To understand what biotin shampoo is, we need to first take a look at biotin …

Q: What is the best supplement for hair nails?

A: – Promotes healthy nails and hair – Contains biotin, keratin and other nutrients that keep the system healthy – Minimizes hair shedding to encourage hair growth – Adds to the thickness of nails and hair – Free from gluten and dairy products – Safe for both men and women – Contains Cynatine HNS Keratin that helps hair to withstand different issues

Q: What is the best vitamin for hair and nails?

A: Biotin: Biotin is a type of vitamin B that helps your nails via healthy cell growth and improves protein-building amino acids’ metabolism. Eating proteins in your diet: Eating proteins in your diet is pretty self-explanatory. … Using nails strengthened with keratin: You can find nails strengthened with keratin. …

Q: What are the ingredients in hair skin and nails?

A: if you have kidney disease; if you have had stomach surgery; or if you smoke.