ACV gets touted as a cure-all but is it?
Apple cider vinegar is a home remedy that has developed a high profile, credited with curing everything from helping you to lose weight to treating fatty liver to curing eczema. How many of these claims are supported by science, and are these findings limited to apple cider vinegar?
When you consume vinegar with food, you add acidity to the stomach contents. The acid the stomach produces itself is many times stronger than vinegar, but not everyone produces enough of it. The consequences of low stomach acid (hypoacidity) include poor sterilization of food, incomplete digestion of proteins and reduced absorption of minerals and vitamin B12. A wide variety of conditions can improve when normal stomach digestion is restored with increased consumption of vinegar. Here is a list of some of the claims, not all of which are supported by research:
GERD (gastroesophageal reflux)
Symptoms of GERD can occur no matter how much acid is produced by the stomach. Because the tissues of the esophagus are so delicate, GERD is often treated with acid reducing medications to protect the esophagus, not because your stomach is making too much acid. For people with GERD whose acid production is normal or low, treatment with these medications can create or worsen a pre-existing problem, and contribute to the development of nutrient inadequacies. There is a theory that closure of the valve between esophagus and the stomach, the lower esophageal sphincter or LES, is regulated by the acidity of stomach contents. However, studies have shown that the mechanisms in LES regulation are more complicated than this, so research supporting the acidity theory is lacking.
A 2018 study that looked at metabolic response to red date vinegar found it significantly reduced blood cholesterol but did not have a significant impact on blood sugar regulation or liver enzymes in people with type 2 diabetes.
High Blood Pressure
Although there have been many animal studies, especially those with rats, showing vinegar’s antihypertensive effects, research on human response does not yet support this finding.
High Blood Sugar and Weight Loss
Findings with respect to blood sugar control and weight loss have been mixed. Some studies have found no effect , while others have found clinically significant effects . Consuming vinegar might be helpful for some people but it should not be solely relied upon for weight management or treatment of any kind of diabetes until larger controlled studies demonstrate .
Resistance to Infection and Modulation of Immune Functions
Use of the vinegar to treat infection dates back to Hippocrates in 400 BC. Various studies have demonstrated the ability of vinegar to inhibit the growth of many types of infectious organisms, and some studies show it can be an effective treatment for mild infections, including ear infections.  There is some limited evidence that vinegars could modulate immune response in allergies by altering the proteins that trigger the hypersensitivity. 
As popular as apple cider vinegar is for its palatability, all kinds of vinegars have health-promoting properties. Vinegar’s use as a home remedy does have some scientific support, but, as the case with many things, the support is equivocal and is strongest in respect to lowering cholesterol and blood sugar. While vinegar consumed as a food with meals can contribute to better health, caution should be used with supplemental vinegar, as it can be a causative factor in corrosive injury  and osteoporosis .
 Functional Properties of Vinegar, 2014