Could anyone help me with this question (perhaps previously discussed somewhere, have searched but not found it):
I have been wondering about the Omega3 supplements made from fish oil and to what extent these might contain heavy metals and other toxins (which are of course present in fat fish). Suppliers usually claim the oils/supplements have been de-contaminated, but has this been tested by a third party?
Are there any brands that are proven to contain less heavy metals/toxins than others?
Cold-pressed extra virgin coconut, macadamia nut, avocado, and olive oils. Organic if you can afford. And eating those foods.
Yes, there is a third party. Take a look at this, and only buy 5 star oils:Could anyone help me with this question (perhaps previously discussed somewhere, have searched but not found it):
I have been wondering about the Omega3 supplements made from fish oil and to what extent these might contain heavy metals and other toxins (which are of course present in fat fish). Suppliers usually claim the oils/supplements have been de-contaminated, but has this been tested by a third party?
Are there any brands that are proven to contain less heavy metals/toxins than others?
There are good PUFAs and bad PUFAs. You can't lump them all together. Anyway, you feeling better without PUFAs is not evidence of anything. There are tons of studies showing that omega-3s - in the right amounts - are healthy and essential.He quotes plenty of studies which are independent of agricultu ral industry influence who want fast growth from aminal feeds. Since taking his advice over cutting PUFA my immune system has improved. Even though I have added plenty of saturated fat my weight is going down.
By all means, listen to Ray Peat, instead of doing some research by yourself. After all, he is a "nutritionist":Yes and plenty of studies saying the opposite.
http://en.wikipedia.org/wiki/NutritionistHowever in many countries and jurisdictions, the title "nutritionist" is not subject to professional regulation; any person may call themselves a nutrition expert even if they are wholly self-taught.[2] In most US states, parts of Canada, Australia, and the United Kingdom, the term nutritionist is not legally protected, whereas the title of dietitian can be used only by those who have met specified professional requirements.
Postepy Hig Med Dosw (Online). 2011 Jun 2;65:314-27.
[The role of docosahexaenoic acid in neuronal function].
[Article in Polish]
Walczewska A, Stępień T, Bewicz-Binkowska D, Zgórzyńska E.
Source
Zakład Interakcji Międzykomórkowych, Katedra Fizjologii Doświadczalnej i Klinicznej, Uniwersytet Medyczny w Łodzi. anna.walczewska@umed.lodz.pl
Abstract
Docosahexaenoic acid (DHA, C22: 6n-3) is the most abundant polyunsaturated fatty acid in neuronal phospholipids, particularly in the cortex. The main source of DHA for neural cells is food, and hepatic and astroglia DHA synthesis from essential a-linolenic acid (C18: 3n-3). Accretion of DHA in the brain is most intensive during fetal life and the first two years of life. An adequate level of DHA in cell membranes is important for many functions of neural cells and this is presumably the reason for DHA saving in the adult mammalian brain during dietary a-linolenic acid deficiency. DHA-containing phospholipids in membranes are flexible and membranes possessing a high content of them are quite thin, more permeable to ions and small molecules, have looser lipid packing, and finally are more "dynamic" than membranes composed of otherfatty acid containing phospholipids. Furthermore, these membranes create an appropriate environment for integral proteins highly condensed in neurons, such as receptors, ion channels, enzymes, and peripheral proteins. The quantity of phosphatidylserine in the inner membrane lipid layer depends on the availability of DHA to neurons. Phosphatidylserine promotes neuronal survival by translocation/activation of kinase Akt and Raf-1/MEK. DHA present in membrane phospholipids facilitates v-SNARE/t-SNARE complex formation, which is necessary for fusion of synaptic vesicles and plasma membranes necessary for transmitter exocytosis, and neurite outgrowth-dependent plasticity. DHA plays an important neuroprotective role. DHA has been shown to inhibit PGE2 synthesis and COX-1 expression in astrocytes, and DHA derivatives, especially neuroprotectins D, can suppress inflammatory responses, preventing neuronal damage or apoptosis. The results of high DHA content in neuronal membranes and formation of DHA derivates, as well as the function of DHA-dependent phosphatidylserine, may explain the promising results supporting beneficial DHA supplementation in neurodegenerative diseases and improvement of brain function.
PMID:
21677356
Anne, "pharmaceutical grade" means purified to the extent it could be used as a control substance in scientific experiments.
Yes, there is a third party. Take a look at this, and only buy 5 star oils:
The International Fish Oil Standards Program
http://www.ifosprogram.com/consumer-reports.aspxSame question here: I'm so brain fogged right now - any chance you have brand names which are 5 star?