GiantMuscle
Duncan Pharma rep
The Effects of Steroid Use on Thyroid Function
The impact of anabolic androgenic steroids (AAS) on thyroid function is a topic seldom discussed in bodybuilding circles. Does AAS use benefit or harm the thyroid?
This article reviews the relationship between AAS and thyroid hormones, suggesting that low doses of exogenous thyroid hormones during AAS cycles might be advantageous.
How AAS Affects Thyroid Hormone Production
AAS have a complex influence on thyroid hormones, causing various physiological changes. AAS can suppress the secretion of thyroid-stimulating hormone (TSH) from the pituitary gland, which is crucial for producing and releasing thyroid hormones, T3 and T4. Suppression of TSH leads to lower levels of T3 and T4 in the bloodstream, potentially causing hypothyroidism.
Furthermore, AAS can alter the conversion of T4 to T3. T4, produced by the thyroid gland, is not as biologically active as T3. The conversion to T3, which regulates metabolism, can be disrupted by AAS, resulting in decreased active T3 levels and a slower metabolic rate.
The extent of AAS's impact on thyroid hormones can vary based on dosage, duration, individual genetics, and the specific type of steroid used. For instance, Stanozolol (Winstrol) notably affects thyroid hormones more than others.
These effects can result in hypothyroidism and a lower metabolic rate, making fat loss more difficult for the user.
Suggested Approach
Given that AAS can impair thyroid function, it may be wise for AAS users to include T3 in their cutting cycles. While many bodybuilders use high doses of T3 to enhance fat loss, this poses significant health risks. A lower dose of T3 could mitigate AAS's negative impact on thyroid hormone production without causing severe side effects like elevated heart rate and blood pressure.
Experienced bodybuilders likely already use high doses of T3 during cutting cycles and may not need additional measures. However, for those not ready for high T3 doses but still seeking to optimize thyroid function during AAS cycles, a daily intake of 12.5 to 25 mcg of T3 could be considered.
Note that any T3 dosage will suppress endogenous thyroid production by reducing TSH. However, thyroid hormone levels generally recover within a few weeks after stopping T3, so no post-cycle therapy (PCT) is needed, although it’s advisable to avoid overeating during this recovery phase.