What is the Optimal Vitamin C Intake?


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  • Question. Does taking it in one dose vs. multiple doses change anything. I just wonder if it would change if you break up the doses like you would meals.

  • it would be interesting if Dr Greger would do another video on vitamin C and incorporating research and clinical trials (maybe not the correct terminology) conducted and or cited by the vitamin C foundation. They indicate reversing cancer with intravenous therapy of high dose sodium ascorbate; as well as reversing heart disease and reversing diabetes with vitamin C alone.

  • I, heretofore, had a lot of respect for Dr. McGregor. This video however is way off the mark. In just a 3 minute video, Dr. McGregor has completely dismantled the work of Dr. Linus Pauling.

    Since Pauling's death, the medical establishment has reclaimed the scientific position with a series of experiments on vitamin C. In particular, the NIH measured the distribution of vitamin C in the body and claimed that Pauling was wrong about the need for high doses, as the blood could be saturated at low doses [Proc. Natl. Acad. Sci. USA, 93, 3704-9.]. They added that doses higher than one gram were potentially dangerous. From this point on, the high dose vitamin C lobby were on the defensive.

    If the body could be saturated at low doses, the argument went, higher doses were simply a waste or even potentially dangerous. However, clinical reports of the utility of high dose vitamin C had been repeated in the literature for over 50 years. These reports continued, particularly in the fields of heart disease, infections and cancer, contradicting the NIH conclusions. Either the clinical reports of the efficacy of high doses were incorrect, or the NIH experimental work was flawed.

  • I really dont like this "Dr Gregers head walking" in the video. It is about the facts, not the presenter. Also I feel like it gives away so much of the seriousness of the videos. I don't like to share these videos anymore, cuz it just doesn't feel like science anymore (and the first impression is really important to people) but rather some doctor wanting to present himself. It makes me sad to see these newer videos. Unfortunately Dr Greger must have had a lot of bad advisors (or rather fanboys) lately.

  • I will reiterate what others are saying about ascorbic acid not being the same as Vitamin C, ascorbic acid is produced by bacteria in a factory while natural Vitamin C is produced by a plant. Ascorbic acid is an organic acid but it doesn't have the same properties as the Vitamin C found in fruits and vegetables. I prefer to eat natural instead of taking a supplement.

    Here are a few ways to get 200 mg of natural Vitamin C:
    15 oz of orange juice
    7 oz of lemon juice
    2 cups of broccoli
    4 oranges
    1 papaya
    2 cups brussel sprouts

    Another point is you should split the 200 mg into two or more servings per day, for example I have a glass of orange juice with breakfast and a cup of broccoli with dinner.

  • My searches have indicated a cup of orange juice has just 124mg of Vitamin C…Obviously not enough C for the day even in an entire cup of OJ, a ''cup'' which I'm assuming is 8 ounces…WOW, not nearly enough C for the day there in that OJ…lovely. Anyway the "ascorbic acid" in most supplements is NOT real Vitamin C, I read awhile back it's only ONE EIGHTH the molecule of Vitamin C, it's garbage, so overall with just those two factoids mentioned above, no wonder most have colds and such in the Winter, most of us are simply not getting enough C in the first place.

  • May differ in a point, the intake of vitamin C needed depends of the requirements of the vitamin (remember that's a cofactor of collagen) that varies between individuals. Without any pathology and if you are between the age span of the study is 200 mg a day, with pathologies it rises and a rises a lot. So the basal need may be 200mg but not the therapeutic need. See a great book called Ascorbate, by two biochemists phd Hillary Roberts and Steve hickey.


  • high dose vitamin C has been shown in many cases over the last 80 years to cure many diseases. A much better way of asking the body how much vitamin C does it need is to take vitamin C up to bowel tolerance. when the body is sick it can not only handle 20 gram per day but that dose can cure viral infections within days. when the body is healthy bowel tolerance is only a few grams per day.

  • I'm Caucasian, so I should get around 20 minutes of noonday sunshine under ideal conditions. Take a stick and if the shadow is longer than the stick you won't be getting any vitamin D from the sun. I would say the optimal place to get your vitamin D is in the mountains of Quito, Ecuador.

  • 200mg per day is a close number for adults but recent studies have shown 3mg per kg of weight is more accurate. So a 30kg(66lb) child should get 90mg while a 80kg(176lb) adult should get 240mg.

  • What doesn't make sense is that this video says that if someone takes 1250mg of Vitamin C the body absorbs only 46% of it. Sorry, but I did the math and 46% of 1250mg is a lot more than 200mg.

  • Absorption by the intestine might simply be due to osmotic or similar reason. Just because the body can't absorb more doesn't mean consumption has reached its healthful optimal level. It just means that supplementation becomes less efficient, and like you said, the excess is excreted in the stool. Maybe we need to explore time-released version, or taking smaller doses repeatedly. The body can store at least six months worth (the time it takes for scurvy to appear when properly pre-loaded). So the upper concentration in the blood could just as easily mean the excess is being stored in tissues, rather than merely excreted in urine.

    If we're really only supposed to have an intake of 200 mg per day, then why in the world do goats make 13,000 mg in their bodies every day, and even more when stressed? The huge amount of Vitamin C generated per body weight in most mammals strongly suggests that losing the ability to make Vitamin C is a significant shortcoming only minimally mitigated by being able to consume, store and recycle Vitamin C by various mechanisms.

  • Cytoplan and Nature’s Own sell an acerola cherry supplement. Each capsule contains 800mg of whole cherry powder which provides 200mg of vitamin C 🍒

    I eat fruit and veg, too. But they’re handy to make sure you always hit 200mg.

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