welcome to the forum
one thing you could ask for would be a serum zinc test..
Zinc Status and Serum Testosterone Levels of Healthy Adults http://www.sciencedirect.com/science/ar ... 079680058X
Zinc deficiency is prevalent throughout the world, including the USA. ... Dietary zinc restriction in normal young men was associated with a significant decrease in serum testosterone concentrations after 20 weeks of zinc restriction ... We conclude that zinc may play an important role in modulating serum testosterone levels in normal men."
your test may not come back outright deficient, but you need to watch it with zinc and make sure your levels are high normal.
question: do you eat much in the way of bread/pasta/baked goods?
for the twitching, I would check out serum magnesium. same thing as with zinc - the result will likely come back 'normal' but you want to have levels up at the very very top end of the normal range to prevent deficiency symptoms.
The underestimated problem of using serum magnesium measurements to exclude magnesium deficiency in adults; a health warning is needed for “normal” resultshttp://www.degruyter.com/view/j/cclm.20 ... 10.077.xml
"The perception that “normal” serum magnesium excludes deficiency is common among clinicians. This perception is probably enforced by the common laboratory practice of highlighting only abnormal results. A health warning is therefore warranted regarding potential misuse of “normal” serum magnesium because restoration of magnesium stores in deficient patients is simple, tolerable, inexpensive and can be clinically beneficial."