Dude just stop. You have made a poor life choice and you are adamantly trying to justify it. It's just sad. Read below.
It takes three reactions in our body to make EPA from ALA and another four reactions to change that EPA into DHA.
In order to successfully complete these reactions, the body needs an adequate supply of B3 and B6 vitamins, magnesium, and zinc.
Without enzymes, converting ALA into DHA and EPA wouldn’t be possible.
The greatest inhibitor of this lengthy chemical process for most people isn’t the absence of nutrients, however, it’s the enzymatic activity (or lack thereof) required to make it all happen.
Enzymes act as catalysts to get things rolling; think of them as the spark needed to ignite the gas on that old stovetop your grandma has. Without enzymes, converting ALA into DHA and EPA wouldn’t be possible.
The enzymes needed in this particular series of reactions are fickle things that are easily disrupted.
Additionally, enzymatic activity is negatively affected by genetics, age, health, and diet. Too many omega 6 fatty acids, for example, throw off the entire EPA/DHA conversion process.
At the end of the day, the rate of conversion from ALA to EPA and then DHA is, unfortunately, not great.
It’s estimated to sit around 6% for EPA and 3.8% for DHA.
Factor in the declined rate of conversion when too much omega 6 is present and those (already small) percentages decrease by an additional 40-50%.
If you’ll allow me to do the math for you, assuming that we’re all at least somewhat out of whack in the omega 6: omega 3 department, that’s a conversion rate of roughly 3% for EPA and 1.9% for DHA.