什么是PABA？对氨基苯甲酸完全指南
摘要
PABA（对氨基苯甲酸）通常被归类为B族维生素，但更准确的描述是folic acid（叶酸）的前体。它主要由肠道微生物产生，而非由人体自身合成，并在皮肤健康和紫外线防护方面发挥重要作用。
核心要点
- PABA并非真正的B族维生素 — 它是一种维生素前体，人体用其来合成folic acid
- 它被归类为非必需维生素，因为它不需要直接从食物中摄取
- PABA由肠道微生物产生，而非直接由人体细胞合成
- 抗生素的使用会消耗负责产生PABA的微生物，可能导致缺乏
- PABA可通过膳食来源获取，包括动物内脏、乳制品、鸡蛋、蔬菜和蘑菇
- 它有助于维持皮肤柔软度和肤色
- PABA有助于保护皮肤免受紫外线辐射，这也是它出现在某些防晒产品配方中的原因
- 它可能对患有vitiligo（白癜风）的人有益，该病症涉及皮肤色素的丧失
详细说明
PABA的真实身份
PABA是对氨基苯甲酸的英文缩写。尽管它被广泛认知为B族维生素，Dr. Berg指出它更准确地应被称为前体维生素 — 即人体用来制造folic acid（维生素B9）的构建模块。由于这种间接作用，它被标注为”非必需”维生素，意指不需要直接通过饮食摄取。
PABA的来源
PABA的主要来源并非人体自身代谢，而是**gut microbiome（肠道微生物群）。消化道中的有益微生物能够自然合成PABA。这意味着曾接受抗生素治疗**的人，由于微生物群落遭到破坏，PABA的产量可能会受到影响。
能够提供PABA的膳食来源包括：
- 动物内脏
- 乳制品
- 鸡蛋
- 蔬菜
- 蘑菇
皮肤健康益处
PABA与皮肤健康有几项值得关注的关联：
- 紫外线防护 — PABA能够吸收紫外线辐射，这也是它历来被作为活性成分添加到防晒霜和防晒乳液中的原因
- 肤色与柔软度 — 充足的PABA水平与改善皮肤质地和外观有关
- 白癜风 — PABA可能对vitiligo（白癜风）有益，该病症表现为皮肤局部区域色素消失
相关概念
- PABA（对氨基苯甲酸）
- folic acid（叶酸）
- gut microbiome（肠道微生物群）
- vitiligo（白癜风）
- UV radiation（紫外线辐射）
- antibiotic use（抗生素使用）
- B vitamins（B族维生素）
English Original 英文原文
What is PABA? A Guide to Para-Aminobenzoic Acid
Summary
PABA (para-aminobenzoic acid) is commonly classified as a B vitamin, but it is more accurately described as a precursor to folic acid. It is produced primarily by gut microbes rather than the body itself, and plays roles in skin health and UV protection.
Key Takeaways
- PABA is not a true B vitamin — it is a pre-B vitamin that the body uses to synthesize folic acid
- It is classified as a non-essential vitamin because it does not need to come directly from food
- PABA is produced by gut microbes, not directly by human cells
- Antibiotic use can deplete the microbes responsible for producing PABA, potentially leading to deficiency
- PABA can be obtained through dietary sources including organ meats, dairy, eggs, vegetables, and mushrooms
- It supports skin softness and tone
- PABA helps protect skin against UV radiation, which is why it appears in some sunscreen formulations
- It may benefit people with vitiligo, a condition involving loss of skin pigmentation
Details
What PABA Actually Is
PABA stands for para-aminobenzoic acid. Despite being widely known as a B vitamin, Dr. Berg clarifies it is more precisely a precursor vitamin — meaning it is a building block the body uses to manufacture folic acid (vitamin B9). Because of this indirect role, it is labeled a “non-essential” vitamin in the sense that it doesn’t need to be consumed directly through diet.
Where PABA Comes From
The primary source of PABA is not human metabolism but rather the gut microbiome. Beneficial microbes in the digestive tract synthesize PABA naturally. This means that individuals who have undergone antibiotic treatment may have compromised PABA production due to disruption of these microbial populations.
Dietary sources that supply PABA include:
- Organ meats
- Dairy products
- Eggs
- Vegetables
- Mushrooms
Skin Health Benefits
PABA has several notable connections to skin health:
- UV protection — PABA absorbs ultraviolet radiation, which is why it has historically been included as an active ingredient in sunscreens and suntan lotions
- Skin tone and softness — adequate PABA levels are associated with improved skin texture and appearance
- Vitiligo — PABA may be beneficial for vitiligo, a condition in which areas of skin lose their pigment
Mentioned Concepts
- PABA (para-aminobenzoic acid)
- folic acid
- gut microbiome
- vitiligo
- UV radiation
- antibiotic use
- B vitamins