A targeted combination formulated specifically to support a healthy balance of thyroid hormones by increasing conversion of T4 to T3. Many people with thyroid issues have difficulty making this conversion and so by providing this blend of cofactor nutrients and specific botanicals, levels of the active hormone, T3, can be optimised. Selenium, magnesium and zinc are all important co-factor nutrients for this process, meaning they are required by the enzymes that make this chemical happen. Because levels of T3 are not routinely tested for, T-Convert may be particularly helpful for those who are resistant to other therapies, ie those whose laboratory markers TSH and T4 appear within normal range but who feel no improvement. Can be used in conjunction with thyroid hormone medication under the supervision of a healthcare professional.

T4 to T3? Many people have heard of thyroxine (T4) but few are aware that this must be converted into triiodothyronine (T3) in the body. T3 is the most active form of thyroid hormone that the body can use. The conversion of T4 to T3 requires a range of essential micronutrients and takes place in the thyroid, liver, heart, muscles, nerves and even the microbiome. In particular, the deiodinases are selenium-containing enzymes that are used for synthesis of T3. Many factors can either hinder or support the conversion of T4 to T3, including stress, elevated oestrogen, nutrient deficiencies, poor microbial balance in the gut, inflammation and immune dysfunction.

Gum guggul is a natural resin extracted from the mukul myrrh tree native to India, as well as some parts of northern Africa and central Asia. The tree and its yellowish sap or gum resin has been a significant component of Ayurvedic medicine for more than 3000 years. Research shows that this plant extract can help to support the healthy production of T3, with its health benefits being attributed to one of its active components called guggulsterone.


Contains the amino acids tyrosine and phenylalanine.
B vitamins and copper are essential co-factors in the metabolism of tyrosine.
Kelp is a concentrated source of bio-available iodine, which supports the normal production of thyroid hormones and thyroid function.
Contains B vitamins such as niacin, riboflavin and vitamin B6, which all support energy-yielding metabolism and the reduction of tiredness and fatigue.

Each tablet typically contains:

Mukul myrrh extract (gum guggul)



Magnesium (as bisglycinate, oxide)


Zinc (picolinate)


Copper (gluconate)


Selenium (selenomethionine)


*µg RE = micrograms retinol equivalents

Tableted with: Magnesium stearate, Microcrystalline cellulose, Silicon dioxide, Stearic acid, Dicalcium phosphate, Hydroxypropyl methylcellulose, Glycerine

2 tablets daily with food, or as directed.

Nutri Advanced supplements should not be used as a substitute for a varied diet and healthy lifestyle. Results may vary between individuals.

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T-Convert, 60 capsules

  • Product Code: NA-TCONV
  • Availability: In Stock
  • £23.70

  • Ex Tax: £19.75

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Tags: thyroid, t4, thyroxine