"...At the end of the trial, bone mineral density tended to increase in groups B and A (B > A). In conclusion, L-carnitine is effective in both reversing and preventing symptoms of hyperthyroidism and has a beneficial effect on bone mineralization. Because hyperthyroidism depletes the body deposits of carnitine and since carnitine has no toxicity, teratogenicity, contraindications and interactions with drugs, carnitine can be of clinical use.

PMID: 11502782 [PubMed - indexed for MEDLINE]Free Article"

Also--


1. Neurology. 1981 Jan;31(1):93-5.

Thyroid function in Parkinson disease.

Berger JR, Kelley RE.

We conducted a prospective study of thyroid function in 46 patients with
Parkinson disease and 46 age- and sex-matched controls with other neurologic
disease. There was no statistical difference in serum thyroxine (T4) and T3 resin
uptake (T3U) between the two groups. Neither the duration nor the quantity of
L-dopa or carbidopa/L-dopa (Sinemet) therapy influenced these assessments of
thyroid function. However, 3 of 46 Parkinson patients were hypothyroid, whereas
none of 46 controls was hypothyroid. There was one hyperthyroid individual in
each group. Early evaluation of thyroid function in all patients with Parkinson
disease is recommended because of the unexpected frequency of hypothyroidism and
because hypothyroid symptoms may be masked.


PMID: 7192833 [PubMed - indexed for MEDLINE]