A patient with hypothyroidism is given a prescription for levothyroxine (Synthroid). When the nurse explains that this is a synthetic form of the thyroid hormone, he states that he prefers to receive more "natural" forms of drugs. What will the nurse explain to him about the advantages of levothyroxine?
a. It has a stronger effect than the natural forms.
b. Levothyroxine is less expensive than the natural forms.
c. The synthetic form has fewer adverse effects on the gastrointestinal tract.
d. The half-life of levothyroxine is long enough to permit once-daily dosing.