Sebum production is driven primarily by hormones, especially androgens, and by growth signals triggered by your diet. Reducing oiliness from the inside means targeting these two pathways: lowering the hormonal signals that tell your sebaceous glands to produce more oil, and changing the dietary inputs that amplify those signals. Several natural strategies have clinical evidence behind them, ranging from simple dietary shifts to specific supplements.
Why Your Body Overproduces Sebum
Your sebaceous glands contain receptors for androgens, the family of hormones that includes testosterone and its more potent derivative, DHT. When DHT binds to these receptors, it switches on genes that ramp up oil production. Your skin actually manufactures its own androgens locally: sebaceous glands contain the enzymes needed to convert weaker hormones into testosterone and DHT right at the source. This is why oiliness often spikes during puberty, when circulating androgen levels rise sharply in both sexes.
The second major driver is insulin-like growth factor 1, or IGF-1. When your blood sugar and insulin spike after eating, IGF-1 levels rise in response. IGF-1 then stimulates fat production inside sebocytes (the cells that make sebum) by activating a lipid-building pathway. It also amplifies androgen activity. So hormones and diet aren’t separate problems. They feed into the same system, and addressing both gives you the most control.
Lower Your Glycemic Load
High-glycemic foods, think white bread, sugary drinks, white rice, and most processed snacks, cause rapid blood sugar spikes. Your body responds with a surge of insulin, which in turn raises IGF-1. That elevated IGF-1 directly increases lipid production in your sebaceous glands and boosts androgen signaling. Research published in the Annals of Dermatology confirmed that IGF-1 upregulates the fat-building machinery inside sebocytes through a specific signaling chain that also increases inflammatory markers.
Swapping high-glycemic carbs for lower-glycemic alternatives is one of the most impactful dietary changes you can make. Whole grains, legumes, non-starchy vegetables, and most fruits release glucose slowly, keeping insulin and IGF-1 lower. You don’t need to eliminate carbs entirely. The goal is reducing the size and frequency of blood sugar spikes throughout the day.
Dairy and IGF-1
Milk naturally contains IGF-1 and also stimulates your body to produce more of it. Skim milk appears to be a bigger contributor than full-fat varieties, likely because processing concentrates certain bioactive proteins. If you’re dealing with persistent oiliness or acne, reducing dairy intake for several weeks is a reasonable experiment to see if it makes a difference for your skin.
Zinc Supplementation
Zinc is one of the better-studied minerals for sebum control. In a randomized, double-blind trial, men taking zinc sulfate daily for three weeks showed a statistically significant reduction in sebum secretion rates compared to placebo. Zinc appears to work through multiple mechanisms: it has mild anti-androgen properties, supports normal skin cell turnover, and plays a role in inflammatory regulation.
Most studies on zinc and skin have used doses equivalent to roughly 30 to 50 mg of elemental zinc per day, though the forms vary (zinc sulfate, zinc gluconate, zinc picolinate). Taking zinc with food reduces the nausea it sometimes causes on an empty stomach. If you supplement long-term, pairing it with a small amount of copper (1 to 2 mg) helps prevent a copper deficiency, since the two minerals compete for absorption.
Saw Palmetto as a DHT Blocker
Saw palmetto extract, derived from the berries of a small palm tree, competitively inhibits the enzyme 5-alpha reductase, which converts testosterone into DHT. In a 16-week randomized, placebo-controlled trial, oral saw palmetto oil reduced serum DHT levels by approximately 1.29-fold compared to baseline, a statistically significant drop versus placebo. Lower DHT means fewer signals reaching your sebaceous glands telling them to produce oil.
Saw palmetto contains 85 to 90 percent fatty acids along with plant sterols that contribute to its anti-androgen activity. It’s widely available as a supplement and is generally well tolerated. The effect builds gradually over weeks, so it’s not something that produces overnight results. Because it influences androgen metabolism, people taking hormonal medications or contraceptives should be aware of the potential interaction.
Spearmint Tea for Androgen Reduction
Spearmint has documented anti-androgen properties that go beyond folk remedy status. A randomized controlled trial in women with polycystic ovarian syndrome found that drinking spearmint tea twice daily for 30 days significantly reduced both free and total testosterone levels. Participants also reported subjective improvements in androgen-related symptoms.
Two cups of spearmint tea per day is the dose used in the clinical trial. It’s a low-risk intervention with a mild mechanism of action. For people whose oiliness is tied to elevated androgens (common in women with hormonal acne concentrated along the jawline and chin), spearmint tea is worth trying as part of a broader strategy.
Green Tea Extract and EGCG
The compound EGCG, found in high concentrations in green tea, can modulate several factors involved in excess sebum production, including lipogenesis (fat creation in sebocytes), inflammation, and bacterial overgrowth. A randomized, double-blind, placebo-controlled trial tested 1,500 mg of decaffeinated green tea extract daily (providing 856 mg of EGCG) in women with acne over four weeks. EGCG’s ability to dampen IGF-1 signaling and reduce inflammatory markers makes it relevant for internal sebum control.
If you prefer drinking green tea over taking capsules, you’ll get meaningful amounts of EGCG from three to four cups of brewed green tea per day, though the exact concentration varies by preparation. Decaffeinated versions retain most of the EGCG while avoiding the stimulant effects of caffeine.
Omega-3 Fatty Acids
Omega-3 fatty acids, particularly EPA and DHA from fish oil, work on the inflammatory side of sebum production. They downregulate pro-inflammatory cytokines, reduce the production of inflammatory signaling molecules called eicosanoids, and may lower IGF-1 levels. A cross-sectional study in a German cohort found that acne patients had lower omega-3 levels compared to controls, suggesting that a deficit in these fats may contribute to the condition.
Omega-3s don’t necessarily reduce the total volume of sebum, but they shift its composition in a way that makes it less inflammatory and less likely to trigger breakouts. Fatty fish like salmon, mackerel, and sardines are the richest dietary sources. Supplementing with fish oil in the range of 1 to 2 grams of combined EPA and DHA daily is a common approach. Algae-based omega-3 supplements provide the same fatty acids for those who avoid fish.
Pantothenic Acid (Vitamin B5)
Pantothenic acid plays a central role in lipid metabolism through its conversion into coenzyme A, a molecule your body needs to process fats. The theory behind high-dose B5 supplementation is that when coenzyme A levels are higher, your body metabolizes fats more efficiently, leaving less excess lipid to be pushed out through sebaceous glands. A randomized, double-blind, placebo-controlled study tested a pantothenic acid-based supplement providing 2.2 grams per day over 12 weeks in subjects with mild to moderate facial acne.
This is a substantially higher dose than the standard recommended intake of about 5 mg per day. Pantothenic acid is water-soluble and generally considered safe even at high doses, though digestive discomfort can occur. If you try this approach, starting at a lower dose and building up can help your body adjust.
Putting It All Together
The most effective internal approach combines dietary changes with targeted supplementation. Reducing your glycemic load and cutting back on dairy address the IGF-1 and insulin pathway. Zinc, saw palmetto, and spearmint tea target androgen-driven oil production from different angles. Green tea extract and omega-3s help manage the inflammatory component. These interventions work on overlapping systems, so combining two or three of them is more likely to produce noticeable results than relying on any single one.
Expect a timeline of four to eight weeks before you see meaningful changes in skin oiliness. Sebaceous glands don’t shut off overnight, and the hormonal shifts from dietary changes and supplements accumulate gradually. Tracking your skin’s oiliness with blotting papers at a consistent time of day can help you gauge whether a particular strategy is working before you add or swap another one.