[25] Bibliography [edit] 100 Ways to Boost Your Metabolism (2007) ISBN 9780979402708 Personal Trainers' Guide to Earning Top Dollar: A Cutting-Edge Guide to Maximizing Your Income as a Personal Trainer (2009) ISBN 9781606790687 Shape21: The Complete 21 Day Lean Body Manual (2012) ISBN 9781619841413 Endurance Planet's Big Book of Bravado: Tales of Extreme Endurance (2012) ISBN 9781619841345 Get-Fit Guy's Secrets to a Better Workout (2012) ISBN 9781466814226 Weight Training for Triathlon: The Ultimate Guide (2014) ISBN 9781936910656 Beyond Training: Mastering Endurance, Health & Life (2014) ISBN 9781628600476 The Low-Carb Athlete: The Official Low-Carbohydrate Nutrition Guide for Endurance and Performance (2015) ISBN 9781517371531 Christian Gratitude Journal: A Daily Guide for Enhancing Your Mind, Body and Spirit (2017) ISBN 9780692809518 The Forest (2019) ISBN 9780999722701 Boundless: Upgrade Your Brain, Optimize Your Body & Defy Aging (2020) ISBN 9781628603972 Fit Soul: Tools, Tactics & Habits for Optimizing Spiritual Fitness (2020) ISBN 9780999722732 Boundless Cookbook (2021) ISBN 9780578822006 Endure: Tools, Tactics & Habits for Spiritual Stamina (2021) ISBN 9780999722763 Spiritual Disciplines Journal (2021) ISBN 9780999722749 Boundless Kitchen: Biohack Your Body & Boost Your Brain with Healthy Recipes You Actually Want to Eat (2023) ISBN 9781401977740 Boundless Parenting: Tools, Tactics & Habits of Great Parents (2023) ISBN 9780999722770 Boundless: Upgrade Your Brain, Optimize Your Body & Defy Aging, Updated and Revised (2025) ISBN 9781628605396 Personal life [edit] Greenfield married his wife, Jessa, in 2003
[1] [2] Studies have found that correcting B12 deficiency can lead to improvement in ulcer frequency and severity in affected patients
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WEIGHT For those with deficiencies, B12 shots provide the potentially useful perk of increasing metabolism
Vitamin B-12, also known as cobalamin, is a water-soluble vitamin essential for various physiological functions
