黑皮肤的人合成维生素d更难。
People with dark skin have more difficulty making the vitamin.
三甲酚是合成维生素e的重要中间体。
他们宣称自然维生素比合成维生素更好。
They Claim That "Natural" Vitamins are Better than "Synthetic" Ones.
晒太阳时，人类自身能够合成维生素d3。
Humans make their own vitamin D3 when they are exposed to sunlight.
你知道你的身体需要胆固醇来利用阳光合成维生素d吗？
Did you know that your body needs cholesterol to synthesize sunlight into vitamin d?
天然维生素同合成维生素相比，是更好的补养品。
Q9. Natural vitamins are better supplements for the diet than synthetic vitamins.
其生物活性、利用率及安全性均优于合成维生素e。
Its biological activity, utilization and safety are better than synthetic vitamin e.
与合成维生素相比，天然维生素是饮食的更好补给品。
Natural vitamins are better supplements for the diet than synthetic10 vitamins.
综述了光化学法合成维生素D_2和D_3的研究进展。
The research on photosynthesis of vitamin D2 and D3 is reviewed.
例如，很多灵长类动物不能合成维生素c，因为基因变异了。
For instance, many primates cannot make vitamin c, because of a gene mutation.
影响日晒合成维生素D的其他一些因素有：使用防晒霜和防晒衣；
Some other factors that affect levels of sunshine vitamin D are the use of sunscreen and protective clothing;
此外，你所处的纬度以及你的血统也会影响你的身体合成维生素d的能力。
In addition, the latitude at which you live and your ancestry also influence your body's ability to convert sunlight into vitamin d.
阳光是人体合成维生素D的最好方式，但曝露在阳光下同时也会增加皮肤癌风险。
Sunlight is the best source of vitamin D, but exposure to sunlight can also raise the risk of skin cancer.
在结肠内，微生物帮我们合成维生素并且通过分解我们不能消化的食物纤维给我们提供10%的卡路里。
In the colon, microbes synthesise vitamins for us and provide 10% of our calories by breaking down dietary fibre we cannot process.
我们不能合成维生素C（抗坏血酸），但是我们的祖先，包括豚鼠和灵长类，却有合成VC的能力。
We can’t synthesize vitamin C (ascorbic acid), but our ancestors, save for the guinea pig and primates, were able to do so.
由于太阳角的存在，居住在北纬37度以北的人（奥马哈接近41度）在冬天时不能天然合成维生素D。
Persons living at latitudes north of the 37th parallel – Omaha is near the 41st parallel – cannot get their vitamin D naturally during the winter months because of the sun's angle.
使用得当的防晒系数为8或更高的防晒霜在完全阻挡紫外线辐射的同时也阻止了维生素d的合成。
Used properly, sunscreens with an SPF of 8 or higher completely block UVB radiation and prevent synthesis of vitamin d.
当然，晒一会太阳对于皮肤中维生素D的合成也是很重要的。
Or course, short periods in the sunlight are also important for synthesizing vitamin D in the skin.
维生素d是在阳光照射下由皮肤合成的，或从摄入的一些食物中获得。
The vitamin is made by the skin during sun exposure, or ingested in a small number of foods.
我还建议大家多用食补，而不是合成产品，这样你的身体能更好的吸收维生素，因为你不是在处理一系列化学品。
I also recommend taking a food-based supplement over a synthetic, as your body will absorb the supplement better because you're not processing a bunch of chemicals.
维生素C是身体合成胶原所必须的物质，胶原蛋白能使皮肤紧致有弹性。
Vitamin C is essential for your body to make collagen, the protein that keeps skin firm and elastic.
维生素b12和叶酸都是合成细胞所必需的，其中也包括血细胞。
B12 and folic acid together are needed for making normal cells, including blood cells.
这也是维生素b - 12缺乏的症状，B - 12是合成红细胞和DNA、维持神经系统正常运转的不可或缺的营养物质。
Those are also symptoms of a deficiency of B-12, a key nutrient needed to make red blood cells and DNA and keep the nervous system working right.
论文的作者希望进一步研究并揭示所谓的太阳光促使维生素合成的生物理论。
The authors of the study agreed that the issue requires further study to shed light on the biological basis of the so-called sunshine vitamin.
只存在于动物性食物中的维生素B12缺乏，或叶酸缺乏时，机体合成的红细胞功能异常，无法为脑细胞供应至关重要的氧。
Inadequate B12, found only in animal products, or folic acid can yield blood cells unable to carry vital oxygen to the brain.
维生素c，以及协助铁的吸收，是参与神经递质的合成。
Vitamin C, as well as assisting in iron absorption, is involved with the synthesis of neurotransmitters.
维生素D也是合成的皮肤暴露在阳光下。
Vitamin D is also synthesised by the skin when exposed to sunlight.
维生素D也是合成的皮肤暴露在阳光下。
Vitamin D is also synthesised by the skin when exposed to sunlight.
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