It’s always best to speak with your doctor when adding new supplements to your regimen, particularly in an effort to avoid medication interactions."
Though many have found success using collagen, there are others who may not be so lucky.
According to Schoenfeld, "If a person has a history of calcium oxalate kidney stones, it is a good idea to take it slow when adding collagen to the diet, starting with no more than 5-6 grams per day (about 1 tablespoon).
And it doesn't raise calcium levels in a good way. Instead, collagen can lead to hypercalcemia.
Symptoms of an allergic reaction include itching or tingling in the mouth or area of skin where collagen is applied, swelling of tongue or skin, wheezing, abdominal pain, nausea, and/or vomiting.
A decrease in tryptophan will cause your serotonin levels to lower which will bulldoze into possibly gaining feelings of nervousness, irritability, anxiety, and depression.
These products are not FDA regulated and their contents are questionable in terms of efficacy and potential side effects.