The penis size results are different in various study measurements. The consensus is that the average erect human penis is approximately 12.9–15 cm (5.1–5.9 in) in length with a 95% confidence interval of (10.7 cm, 19.1 cm) or (4.23 in, 7.53 in). The typical girth or circumference is approximately 12.3 cm (4.84 in) when fully erect. From the data given above, you might see that the girth you reported (5.75 inches) is still within normal range.
However, if you are unhappy with the penile circumference, you might consider penis widening with injections of specific substances. There are no medically proven exercises that can increase the penile circumference.
Also, data cannot be found that certain substances in energy drinks might affect penile length and girth.
You might want to visit a urologist and talk about your medical options to increase penile girth.
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