lol , actually , randy's suggestion is better
, use it during the end when u may need it , androgens may supress thyroid levels , so adding 25 mcg at some stage might help restore normalcy in the body , also , quoting haycock :
"When done properly, T3 is used as "replacement therapy" and serves only to normalize decreased T3 levels. Research has shown that high dose androgens pushes T3 levels down (14,15). This is significant because the real value of optimal thyroid levels is not for fat loss, but instead for optimum anabolic activity. T3 has diverse facilitative anabolic effects including, increasing GH secretion(16,17), up-regulating GH receptors (18), up-regulating IGF-1 receptors (19,20), and other less well defined anabolic effects (21,22).
15. Deyssig R., Weissel M. Ingestion of androgenic-anabolic steroids induces mild thyroidal impairment in male body builders. J Clin Endocrin Metab. 76(4): 1069-1071, 1992
16. Markku A., Rahkila P., Reinila M., & Vihko R. Androgenic-anabolic steroid effects on serum thyroid, pituitary and steroid hormones in athletes. Am J Sports Med. 15(4):357-361, 1987
17. Wolf M, Ingbar SH, Moses AC Thyroid hormone and growth hormone interact to regulate insulin-like growth factor-I messenger ribonucleic acid and circulating levels in the rat. Endocrinology 125(6):2905-14, 1989
18. Harakawa S, Yamashita S, Tobinaga T, Matsuo K, Hirayu H, Izumi M, Nagataki S, Melmed S. In vivo regulation of hepatic insulin-like growth factor-1 messenger ribonucleic acids with thyroid hormone. Endocrinol Jpn 37(2):205-11, 1990
19. Hochberg Z, Bick T, Harel Z Alterations of human growth hormone binding by rat liver membranes during hypo- and hyperthyroidism. Endocrinology 126(1):325-9, 1990
20. Matsuo K, Yamashita S, Niwa M, Kurihara M, Harakawa S, Izumi M, Nagataki S, Melmed S Thyroid hormone regulates rat pituitary insulin-like growth factor-I receptors. Endocrinology 126(1):550-4, 1990
21. King RA, Smith RM, Meller DJ, Dahlenburg GW, Lineham JD. Effect of growth hormone on growth and myelination in the neonatal hypothyroid rat. J Endocrinol 119(1):117-25, 1988 "