Ingestion of hydrogen peroxide (H2O2), especially very high strength H2O2, can be very dangerous and can cause some serious health risks and possibly even death.
A United States Food and Drug Administration (FDA) announcement made in 20061 says that drinking high strength H2O2, specifically H2O2 of 35%, is extremely dangerous and can cause several serious ...
One systematic review (1) conducted in 2003 examined the efficacy of several complementary and alternative therapies (including douching with sodium bicarbonate) for yeast vaginitis and bacterial vaginosis
Here an extract of their abstract:
Inconsistencies in definition of vaginitis, type of intervention,
control groups, and outcomes prevented ...
There are several components to this question:
Is hydrogen peroxide (as used in dental hygiene procedures) absorbed into the body in significant quantities?
Could absorbed hydrogen peroxide have systemic effects?
To what extent is oxidative stress a factor in the pathogenesis of vitiligo?
Can absorbed hydrogen peroxide contribute to the pathogenesis of ...
According to Wikipedia this treatment is based on 2 claims:
Cells produce hydrogen peroxide as an immune response/damaged tissue response.
Pathogens can not survive in oxygen rich environment (recall H2O2 decomposes into H2O and O2)
As you may notice the reasoning is rather flawed, even if we assume these two claims to be true. As it turns out though ...
If you feel a cold "coming on" then your body (immune system) is already fighting it.
I was unable to find studies on gargling to prevent respiratory illness.
However the AAFP released guidelines and recommendations for the common cold that looks at many studies for evidence for
Decreasing the length of illness symptoms
I think alcohol is better than peroxide for the reasons stated above.
Nevertheless, from an evidence stand-point, there is no really strong evidence for basically any solution over the other or even for whether to clean or not clean wounds.
Personally (and what is preferred by most in daily practice and generally recommended in guidelines as well) is ...
The study did not investigate the causes of, or possible treatments of, grey hair. However, the research focused on vitiligo, specifically looking at segmental vitiligo (NHS, 2013).
The NHS went further by saying that:
Though the blame for the poor reporting of the study can be put at the door of the press office of the FASEB, which issued a press ...
I don't think gargling could prevent sickness. Flu and cold are caused by viruses and they usually enter from the nostril. That is one of the reason why facial mask cover the nose as well. Regular gargling with Listerine can suppress the bacterial that grow on your teeth gaps but in the long term it will alter the bacterial ecosystem in your mouth.
In this study regarding hydrogen peroxide and human cataract, hydrogen peroxide was shown to damage the proteins in the human lens, thereby leading to the formation of cataract (Spector and Garner, 1981). Using hydrogen peroxide for the eyes will probably result into eye damage.