Concentrate lemon juice is made by removing water from the lemon juice. It is still sold usually in liquid form and is typically more sour than regular or freshly squeezed lemon juice, therefore is used in a very little quantity.
Basically it comes in a bottle, so make sure the packaging is proper, the bottle should be properly sealed and check the expiry date of the product.
Excess lemon juice concentrate can upset our stomach, it also worsens the ulcers and develops GERD(Gastroesophageal reflux disease).(2)
"Information here is provided for discussion and educational purposes only. It is not intended as medical advice or product or ingredient review/rating. The information may not apply to you and before you use or take any action, you should contact the manufacturer, seller, medical, dietary, fitness or other professional. If you utilize any information provided here, you do so at your own risk and you waive any right against Culinary Communications Private Limited, its affiliates, officers, directors, employees or representatives.”