Monsanto?
https://risk-monger.com/2016/04/13/the-risk-mongers-dirty-dozen-12-highly-toxic-pesticides-approved-for-use-in-organic-farming/
Here's one example of organic apple sauce tested by a lab:
https://www.puremarket.com/365-everyday-value-organic-apple-sauce-cinnamon-24-oz
Here's some organic peanut butter filled with heavy metals:
https://www.puremarket.com/365-everyday-value-organic-creamy-peanut-butter-unsweetened-no-salt-454-g
Here's some vegan organic plant protein powder filled will heavy metals:
https://www.puremarket.com/garden-of-life-meal-replacement-organic-raw-plant-based-protein-powder-chocolate-cacao-509-g
There is no perfect method.
But here's a decent place to start:
https://www.puremarket.com/search/food
Look, for example, at how many organic foods get F ratings on heavy metal toxicity:
https://www.puremarket.com/search/food?menu[facet_lab_grade]=F&refinementList[taxonomies.pm-product-diet][0]=Organic
You can even compare them to the non-organic versions which sometimes get A ratings.
It all depends. There's no simple formula here. Any product can be bad, no matter what the label or brand.

the work by Byron Katie:
 
 
 

Confidence arises out of the belief that we possess the skills to "manipulate" reality in some way. When that belief is manifested in reality, it becomes confidence. 
You wanted to have a great job and you got it. This made you confident. You wanted status and you got it. This made you even more confident. But when the job and status are gone, the confidence is also gone. 
I will give you another example. Look at Donald Trump. The guy wanted to be rich, and become a billionaire. He wanted to be around beautiful women and hosted his own beauty pageants. He wanted to become famous on TV, and he became famous. He wanted to become president and he did it. How much confidence do you think Donald Trump has? Everything that he ever wanted, he got.
Trump believes that he has all the necessary skills to manipulate reality and that is the root of his confidence. But if you investigate even deeper, you will notice that the root of confidence is a con that reality plays on us.  
If you want to get your confidence back, set small goals for yourself, and achieve your goals. If you set daily goals and you achieve them for a whole year, you will be the most confident men in your country. 

Boredom is peace misunderstood.
Desire is just fear by another name.
Taking drugs and thinking that you are happy is like taking a loan and thinking you have money.
Happiness may be nothing but a lack of imagination.
99% of your worries today will amount to nothing in a few years; mindfulness is how you understand it now.
For most people travel only broadens the photo-album, never the mind.
If you need a degree to do it, it’s not going to make you wealthy.
Inner peace will give you a face lift that money can't buy.
Getting lost is part of getting there.
The best relationships are built when you don’t need them.
Nothing is lost except, eventually, the illusion of ever possessing it.
The fewer words required, the deeper the understanding.
The larger the group, the worse the conversation.
Being right or wrong is always subject to timeframe and perspective.
We are conscious of pain, but not its absence.
If you don’t feel embarrassed by what you wrote a year ago, grow faster.
You can be burnt to ashes by the same fire that nicely warms you.
The difference between sounding smart and being smart is “I don’t know.”
To mistake the name for the thing, that is the danger of philosophy.
Have the drive to achieve a goal in one year, but the patience to achieve it in ten.
Flow is always there. You're just in the way.
The relationship you have with yourself will determine all your other relationships.
You miss the present when you’re scared of missing it.
Suppose nothing is wrong. What do you do, then?
All self-help boils down to "choose long-term over short-term."
Today's sin is tomorrow's alternative lifestyle.
To have better friends, have fewer friends.
A taste of freedom can make you unemployable.
Salt water is and isn't the ocean.
The goal of media is to make every problem, your problem.
You are the only person who remembers your embarrassing moments.

@MM1988 Like I said, the Stoics were good philosphers and psychologists. When you closely observe your inner nature, you will come to the same basic conclusions. The parallels exist because anyone who studies human nature honestly will tend to see the same core principles at work. It's really just a question of how deeply you go down the rabbit hole, and how you choose to express your insights, from within which cultural background.

They weren't enlightened. But they had some good intuitions and principles and understanding of human psychology, which makes their teachings useful for personal growth.
One does not have to be enlightened to have useful and profound insights about how to live a good life.