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T4 to T3 conversions..need some help

bigtasty25

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Mar 28, 2008
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Need some help with my conversions...is it that 100mcg of T4 is equivalent to 25mcg T3?

I have 50mcg tabs of Thyroxine (t4)...trying to get a T3 equivalent..
thanks ;)
 

Massive G

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Need some help with my conversions...is it that 100mcg of T4 is equivalent to 25mcg T3?

I have 50mcg tabs of Thyroxine (t4)...trying to get a T3 equivalent..
thanks ;)
Yes it's generally 4:1 -
25 mcgs T3 =100 mcgs T4...
BUT it has to be converted, so make sure it is taken on a empty stomach with a full glass of water 1 hour or more before meals. Best time is to take it in the morning or middle of the night when you wake up for a break or from a dream.
T4 is more suppressive too on the thyroid, because of the longer half life-usually takes 6 -8 weeks before endos will adjust a dose of T4 but that doesn't mean it doesn't convert quickly.
T3 of course can be taken with food and at any time of the day.
 

MurroGen

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Yes it's generally 4:1 -
25 mcgs T3 =100 mcgs T4...
BUT it has to be converted, so make sure it is taken on a empty stomach with a full glass of water 1 hour or more before meals. Best time is to take it in the morning or middle of the night when you wake up for a break or from a dream.
T4 is more suppressive too on the thyroid, because of the longer half life-usually takes 6 -8 weeks before endos will adjust a dose of T4 but that doesn't mean it doesn't convert quickly.
T3 of course can be taken with food and at any time of the day.

@ Massive G, so it would be wise to cycle off T4 after 6-8 weeks then? well, i mean taper down and then off.
 

Massive G

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it's probably wouldn't be a bad idea to cycle off T4....when off ..if metabolic lag occurs with the thyroid from the T4 and the HPTA...you could use small amounts of T3 while it recovers.....
 

vo2maxx

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Reverse T3

Yes it's generally 4:1 -
25 mcgs T3 =100 mcgs T4...
BUT it has to be converted, so make sure it is taken on a empty stomach with a full glass of water 1 hour or more before meals. Best time is to take it in the morning or middle of the night when you wake up for a break or from a dream.
T4 is more suppressive too on the thyroid, because of the longer half life-usually takes 6 -8 weeks before endos will adjust a dose of T4 but that doesn't mean it doesn't convert quickly.
T3 of course can be taken with food and at any time of the day.

MG,

I'm certainly no expert, but perhaps you will know more about this. I once believed the t4-t3 conversion was relatively easy to understand until I started to think about cortisol. Wouldn't it make sense to take the t4 when cortisol is lowest to prevent the t4 conversion to reverse t3 ?
 

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