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The average dose of a supplement is anywhere between 1-2 grams, so if you take fish oil, your body will need to metabolize those calories

Subjects were excluded from l-carnitine or BB challenge testing if they were pregnant, had chronic illness (including a known history of heart failure, renal failure, pulmonary disease, gastrointestinal disorders, or hematologic diseases), had an active infection, received antibiotics within 2 months of study enrollment, used any over-the-counter or prescription probiotic or bowel-cleansing preparation within the past 2 months, ingested yogurt within the past 7 days, or had undergone bariatric or other intestinal (e.g., bowel resection/reconstruction) surgery

500 mcg

That combo goes a long way