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around 50,000 iu if supplementing with thyroid
No, please don't use supplemental A. If you really believe you need more use food.
if you take too much Vitamin A, it can act as an antagonist to thyroid. It acts like a polyunsaturated fat, in competing against the thyroid hormone and can also block the production of adrenal and ovarian steroids if you get too much.
No, please don't use supplemental A. If you really believe you need more use food.
Thanks again @Ella for the wealth of information.Don't underestimate the easy conversion of beta-cryptoxanthins in sun-ripened fruits like oranges, watermelon, mangoes, papaya to retinol. We always think eating liver which is rich in vitamin A, but many are not thinking how much fruit contributes. Beta-cryptoxanthins are handled differently than betacarotenes. Conversion is much more efficient (we still don't know precisely how efficient) and is not dependent on healthy liver. Nearly, 50% of the population do not convert betacarotenes to retinol efficiently, however they easily convert beta-cryptoxanthins, the same constraints don't apply.
a higher metabolism requires more vitamin a, conversely be cautious if hypothyroid with vitamin a supplementation. I think Peat mentioned if hypothyroid to start out with around 5000 -10000 iu no more.
what is the reason a higher metabolism requires more vitamin A? what happens if you have a high metabolism but dont increase your vitamin a intake? does the metabolism slow down then, or something else happens? I remember reading from ray that vitamin a uses the same transporter as thyroid hormone. so wouldnt it have a thyroid limiting effect even if you have a fast metabolism? in which case we should just stick to 5000IU vitamin A regardless of metabolism, and focus on increasing D and K?
Gondalgenesis and that array of hormones entirely depend on thyroid and you guessed it, vitamin A.what is the reason a higher metabolism requires more vitamin A? what happens if you have a high metabolism but dont increase your vitamin a intake? does the metabolism slow down then, or something else happens? I remember reading from ray that vitamin a uses the same transporter as thyroid hormone. so wouldnt it have a thyroid limiting effect even if you have a fast metabolism? in which case we should just stick to 5000IU vitamin A regardless of metabolism, and focus on increasing D and K?
lmaooooooPeat talks about supplementation of vitamin a in one of Danny Roddys generative energy podcasts, no. 31: safe supplements with ray peat.