Jack Challem Books

Vitamin C updated

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Abstract: Health benefits of vitamin C are discussed for the general public in view of selected research findings; controlled studies suggest its contribution to the prevention and correction of i...

Homocysteine

By Victoria Dolby, Jack Challem

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FAQs All about Vitamins Freqently Asked Questions

By Jack Challem

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FAQs All about Chromium Picolinate Freqently Asked Questions

By Jack Challem

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FAQs All about Coenzyme Q10 Freqently Asked Questions

By Jack Challem, Ray Sahelian

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FAQs All about Caratenoids Freqently Asked Questions

By Jack Challem

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Basic Health Publications User s Guide to Vitamin E Don t Be a Dummy

By Jack Challem, Melissa Diane Smith

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Basic Health Publications user's guide to vitamins & minerals

By Jack Challem

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How to Convert ISBN-10 to ISBN-13 (and Vice Versa): A Complete Guide

If you’re in the world of books—whether as a publisher, librarian, bookseller, or avid collector—you’ve likely come across the terms ISBN-10 and ISBN-13. Understanding these formats and knowing how to convert between them is essential for maintaining consistency and compatibility in book records. In this post, we’ll cover everything you need to know about ISBN conversions, step by step.

What is an EAN and How Does it Relate to an ISBN?

If you’ve ever purchased a product online or in a store, you’ve likely come across a barcode. Behind these barcodes lies a standardized system that makes modern commerce possible. Two key codes often encountered are the EAN (European Article Number) and ISBN (International Standard Book Number). But what are they, how are they connected, and why are they so crucial? Let’s explore.