Sun Products


You have some great employees who provide excellent service . Wendy in particular , If I was her boss I'd give her a raise ............she deserves one. regards Greg Hickmott 5

The service from these folks keeps getting better. They were particularly accommodating of my need to have this order very urgently. Very friendly and helpful.5

Another great experience with MyNaturalHealth..great products, super fast delivery, and love the little free gifts. Wonderful staff to deal with. Many thanks5

My first order and I was very impressed by the speed of delivery. Ordered on the 14th, arrived on the 16th and we are on Rural Delivery. Amazing, thank you!5

This company is the BEST to deal with bar none ! Super fast process and delivery, also makes everyone feel special and not just a number. Congrats to Wendy and Sheldon. LOVE THE NEW WEBSITE5

I have to say it is a amazing shopping.Good service .Fast delivery,total 6days from NZ TO CHN. Thank you all.5

Very happy with this website, prices and very speedy delivery. I will use My Natural Health again!!5

This is my 5th order with My Natural Health.... They really are VERY good! They prices are cheaper than anywhere else, super quick delivery (as long as the item is in stock) and super friendly and efficient communication. Highly recommend people try them out, I don't think you will be disappoin...5

Received my order the next day, so very pleased. Thanks again also for the promotional emails, the alert to the clearance Sale, very helpful on this occasion.5

Highly recommend my natural health were fantastic to deal with friendly easy web site to use would definately be buying again have recommended my family member who has also purchased through my natural health also has had a great experience also very prompt fast delievery of product could not ...5


Doctor's Best - L-Tyrosine 500mg

Doctor's Best - L-Tyrosine 500mg

120 Vcaps @


RRP NZD39.90

Doctor’s Best Tyrosine is a conditionally essential amino acid that is a precursor to the
catecholamine transmitters, dopamine, epinephrine, and norepinephrine. These are vital messengers for the brain and the body’s other nerve networks. The thyroid gland also needs tyrosine to make the vital hormone thyroxine.

Doctor’s Best L-Tyrosine supplies the pure L form of tyrosine, an amino acid that has many important functions in the body. Tyrosine or 4-
hydroxyphenylalanine, is one of the 22 amino acids that are used by cells to synthesize proteins.

How Does It Work?
Tyrosine is perhaps best known for its crucial role in the production of certain substances that have vital messenger actions in the brain and the rest of the nervous system. In dopaminergic cells in the brain, L-Tyrosine is converted to L-Dopa by the enzyme tyrosine hydroxylase, then
to 3,4-dihydroxyphenylalanine (Dopamine), a precursor used both for the synthesis of catecholamine messengers (dopamine, epinephrine, and norepinephrine) and for making the pigment melanin.

Increasing the levels of L-Tyrosine in the brain may help to alleviate the neurological decline of catecholamines that are typically decreased in
states of dementia. Melanin, the body’s major pigment that contributes to skin, hair, and eye colour, is synthesized from LTyrosine.
Melanin is very important for regulating the skin’s exposure to ultraviolet (UV) light. The melanin deposited in skin cells forms a barrier—known as supranuclear caps—to shield our DNA from UV radiation.

The catecholamines dopamine, epinephrine (adrenaline), and norepinephrine (noradrenaline) are integral to central nervous
system functions such as cognition, emotion, memory, movement, and regulation of glands that secrete hormones into the
blood. Tyrosine at high doses has been shown to significantly promote positive behaviour characteristics (like mood) and a
superior response to stress in humans exposed to environmental or cardiovascular stressors.

The thyroid secretes two very important hormones, triiodothyronine (T3) and thyroxine (T4). These help regulate our metabolic rate, which closely approximates how intensely we manage our life processes. Hormones T3 and T4 also regulate oxygen use, cellular metabolism,
and the body’s overall growth and development. One of the several steps leading to the formation of thyroid hormones requires that enzymes attach iodine to tyrosine.

• L-Tyrosine, one of 22 amino acids used to make proteins, is a conditionally essential amino acid that is a
precursor to the catecholamine transmitter’s dopamine, epinephrine, and norepinephrine.
• Dopamine, epinephrine, and norepinephrine are vital messengers for the brain and the body’s other nerve
• Supports positive mood and cognitive function
• The thyroid gland uses L-Tyrosine to make the vital hormone thyroxine.
• L-Tyrosine helps prevent cognitive function in response to physical stress.
• Supports the body’s production of Melanin
• Gluten Free, Non-GMO

Dose (adults): Take 1 capsule daily between meals

Ingredients (per 1 capsule ): Tyrosine (L-Tyrosine) 500mg