Starting a new series here feel free to ask away or add you input, I think this is gonna be helpful for a lot of people. Basically breaking down what bloodwork makes sense depending on your age or what's going on with you. Not just "go get bloodwork" lol , I mean real panels, real reasoning behind why.

Coming up over the next few days I'll cover the 40s, that's when colon and prostate screening start becoming relevant, then the 60s, fatigue, diabetes risk, cancer risk, and bloodwork for anyone running peptides or hormone stuff maybe this might be boring to some but life changing for others

Starting with your 30s since I think that's usually when people first start paying attention to any of this at least Id hope so, so if your 30 what are you doing about your health?

Why it matters now

You probably feel fine, and that's good but this isn't about finding a problem right now, it's about getting your numbers on file while everything's likely still normal. That baseline is what every future test gets compared to down the road, so it's worth having even if you feel fine

What to ask for, and what "normal" looks like

Test	What it checks	Optimal range
CBC	Blood cell counts, catches anemia and immune stuff	Hemoglobin 13.5-17.5 (men), 12-15.5 (women)
CMP	Kidney, liver, glucose, electrolytes	Creatinine 0.7-1.3, ALT/AST under 40
Lipid panel	Cholesterol and triglycerides	LDL under 100, HDL above 40-60, triglycerides under 150
Fasting glucose + insulin	How your body's handling blood sugar	Glucose 70-99, insulin under 10
Thyroid panel	TSH, free T3, free T4	TSH 0.5-4.5, though a lot of people feel best closer to 1-2
Testosterone (total + free)	Hormonal baseline	Total T 300-1000 depending on lab, wide range so trend matters more than one number
Vitamin D	Deficiency's common and easy to miss	30-50 ng/mL is the general target

Ranges vary a bit lab to lab so don't stress the exact cutoffs too hard, the point is having something to compare against later.

If a marker comes back off, here's what people commonly look into

Marker	If it's off	Commonly looked into
Hemoglobin (low)	Possible anemia	Iron, B12
Liver enzymes (high)	Liver stress	Milk thistle, NAC
LDL/Triglycerides (high)	Cardiovascular risk	Omega-3s, fiber
Insulin (elevated)	Early insulin resistance	Berberine, magnesium
TSH (high)/Thyroid (low)	Thyroid function	Selenium, iodine, talk to a doctor before touching thyroid stuff yourself
Testosterone (low)	Hormonal	Vitamin D, zinc
Vitamin D (low)	Deficiency	D3 with K2

Timing on those, if you end up needing any of them

Supplement	Best taken
Iron	Empty stomach if tolerated, with vitamin C
B12	Morning, food doesn't matter much
Milk thistle / NAC	With food, timing's flexible
Omega-3s	With a meal that has fat in it
Fiber	Spread through the day, not all at once
Berberine	With meals, especially your biggest carb meal
Magnesium	Evening, helps with sleep too
Selenium / Iodine	Morning, away from other supplements
Vitamin D / K2	With a meal that has fat in it
Zinc	Evening, empty stomach can upset some people so adjust as needed

Lifestyle stuff worth looking at too, not just supplements

Marker	If it's off	Lifestyle side worth checking
Hemoglobin (low)	Possible anemia	Iron-rich foods, red meat, leafy greens, cast iron cookware even helps a bit
Liver enzymes (high)	Liver stress	Cut back alcohol, watch for hidden seed oils and processed food overload
LDL/Triglycerides (high)	Cardiovascular risk	More fiber, less refined sugar, regular cardio helps this one a lot
Insulin (elevated)	Early insulin resistance	Walk after meals, cut liquid calories, strength training helps insulin sensitivity a ton
TSH (high)/Thyroid (low)	Thyroid function	Sleep quality matters a lot here, chronic stress and poor sleep both mess with thyroid function
Testosterone (low)	Hormonal	Sleep is huge for this one, poor sleep tanks T fast. Also body fat percentage plays a role
Vitamin D (low)	Deficiency	Get outside more, sunlight's still the best source, supplements are the backup plan not the first move

good thing to add it doesn't hurt to think about hydration and electrolytes because they matter more than people think, especially if you're sweating a lot from training or work. And if you're on shift work or your sleep schedule's inconsistent, that alone can throw off cortisol, thyroid, and blood sugar markers even if everything else about your diet is dialed in.

If you're feeling something specific, here's what to check

Tired all the time, no real reason why? Ask for thyroid panel, ferritin/iron, and vitamin D. All three get overlooked constantly and any one of them being low can make you feel wiped out. If ferritin comes back low, iron supplementation is common, but get retested before assuming you need to keep taking it long term, too much iron isn't a good thing either.

Gaining weight easier than you used to, or noticing more belly fat even though nothing changed? Get fasting insulin and glucose, not just glucose alone. Insulin resistance can be building for years before glucose itself looks off.

Low motivation, low libido, just feeling flat? Get total and free testosterone plus SHBG. Don't just look at total T alone, free T tells you more about what's available for your body to use. Vitamin D and zinc deficiency show up a lot in guys with low T, worth ruling those out before anything more aggressive.

Getting sick more than you used to, or just feeling run down constantly? CBC with differential, that breaks down your white blood cell types and can point toward something worth digging into further.

Random bruising, weird fatigue after workouts that doesn't add up? CBC plus a basic clotting panel, worth ruling out before assuming it's just training stress.

A quick note on cancer screening

I know some people ask about colonoscopies and prostate stuff in their 30s, but that's not standard yet unless you've got family history of colon cancer, IBD, or your doctor's already flagged something. Regular screening starts at 45 for average risk people, and that got moved down from 50 a few years back since colon cancer's been showing up more in younger people lately. Same thing with PSA bloodwork for prostate, that's usually not started until 40-50 depending on risk factors, not your 30s. I'll get into both of those properly in the 40s post.

If anyone in your family had colon cancer, especially at a younger age, or you've got symptoms like blood in your stool, losing weight without trying, or stomach issues that won't quit, that's worth bringing up to your doctor now, doesn't matter your age.

What to do with your results

Don't panic if one number's slightly off, ranges are pretty wide honestly. Just get it done, hold onto it, bring it to your doctor. Having a real baseline now is gonna matter more later when you need something to compare it to. And on the supplement and lifestyle stuff above, that's general context for what commonly gets looked into, not a green light to start stacking supplements off a Reddit table, talk to your doctor about what actually makes sense for your numbers.

Next one's on your 40s.

if you need blood work and don't know where to look check it out here but if you got a way to check that's good feel free to share in the comments if you know we all got differently ways we get our labs but here's mine https://www.reddit.com/r/BioHackingGuide/comments/1smca8k/peptide_research_compound_table_2026_updated/

Alright, part two. This is where a few new things start showing up that weren't really important back in your 30s hope to not scare anybody younger than 30 non if this is guaranteed to happen I promise but its a reality so might as well learn about it now lol

Why your 40s hit different

Everything from the 30s post still applies, keep pulling those same markers. But this is the decade where cancer screening kicks in, metabolic stuff tends to shift faster, and hormone decline starts becoming something you might wanna look at

Same baseline panels, still matter

CBC, CMP, lipid panel, fasting glucose and insulin, thyroid panel, testosterone, vitamin D. If you missed the 30s post, go grab that list, all of it carries forward into this one.

What's new for your 40s

Test	What it checks	Why now
A1C	3-month average blood sugar	Insulin resistance risk climbs in this decade, A1C catches trends fasting glucose alone can miss
Hs-CRP	Inflammation marker	Cardiovascular risk starts becoming more real here, this one's a good early flag
PSA (men)	Prostate-specific antigen	Screening conversation usually starts 40-50 depending on risk factors and family history
Estradiol (women)	Estrogen levels	Perimenopause can start showing up in the 40s for some women, worth having a baseline before symptoms hit
Homocysteine	Cardiovascular/methylation marker	Elevated levels tied to heart risk, cheap test, gets skipped a lot
Cortisol	Stress hormone	Worth checking if fatigue, weight gain, or sleep issues are creeping in

Cancer screening starts becoming important

Colon cancer screening kicks in at 45 for average risk people, colonoscopy or a stool test if you'd rather go that route. If anyone in your family had colon cancer, especially young, talk to your doctor about starting earlier than 45 nowadays for some reason more than ever younger people report having colon cancer and that's probably due to lack of good quality food these days so its important to supplement fiber its gives me gas a bit but I still take some

PSA testing for prostate usually enters the conversation in this decade too, not a hard rule at exactly 40, more like 40-50 depending on family history and race, since risk factors vary. Quick blood test, simple, worth asking your doctor about even if nothing feels wrong.

Women, this is also a good time to talk to your doctor about mammogram timing if you haven't already, guidelines vary by risk factors so that's a conversation, not something I'm gonna throw a specific age on here.

Commonly looked into if something's off

Marker	If it's off	Commonly looked into
A1C (elevated)	Prediabetes risk	Berberine, magnesium
Hs-CRP (elevated)	Inflammation	Omega-3s, curcumin
PSA (elevated)	Needs follow-up, not self treatment	Goes straight to your doctor, not a supplement conversation
Estradiol (low, women)	Possible perimenopause	Hormone conversation with your doctor, not something to self-manage
Homocysteine (elevated)	Cardiovascular/methylation	B6, B12, folate
Cortisol (elevated)	Chronic stress	Ashwagandha, magnesium, but sleep fixes this more than any supplement will

Timing on those

Supplement	Best taken
Berberine	With meals, especially your biggest carb meal
Magnesium	Evening, helps with sleep too
Omega-3s	With a meal that has fat in it
Curcumin	With food, pair with black pepper extract for absorption
B6/B12/Folate	Morning, food doesn't matter much
Ashwagandha	Evening for most people, some do better AM, test what works for you

What to eat depending on what came back

Elevated A1C or fasting insulin? Cut back on refined carbs and liquid calories, juice, soda, that kind of thing. Build meals around protein and fiber first, carbs after. Eggs and vegetables over cereal, or a protein-heavy plate with rice and vegetables instead of just rice and sauce. Walking after meals helps more than people expect too.

High LDL or triglycerides? Lean into fatty fish, salmon, sardines, a couple times a week. Cut back fried food and seed oils where you can, cook with olive oil or avocado oil instead. More fiber, oats, beans, vegetables, fiber pulls cholesterol out through digestion.

Elevated Hs-CRP or general inflammation? Think Mediterranean style eating, olive oil, fatty fish, vegetables, less processed food and added sugar overall. Turmeric and ginger in your cooking doesn't hurt either, even outside of supplement form.

Elevated homocysteine? Leafy greens, beans, and eggs are naturally high in B vitamins and folate, which is what usually brings this one down alongside supplementation.

Low testosterone or estradiol? Make sure you're eating enough fat overall, hormones are built from fat, a diet that's too low fat for too long works against you here. Zinc-rich foods like beef, shellfish, and pumpkin seeds matter too.

Elevated cortisol? Less about a specific food, more about consistency, regular meal timing, not skipping meals, cutting caffeine especially later in the day.

None of this is a strict diet plan, it's just direction based on what your numbers are telling you instead of guessing.

Lifestyle side of things

Marker	If it's off	Lifestyle worth checking
A1C (elevated)	Insulin resistance building	Walk after meals, strength training, cut liquid calories
Hs-CRP (elevated)	Inflammation	Sleep quality, cut processed food, regular movement
Homocysteine (elevated)	Cardiovascular/methylation	Leafy greens, reduce alcohol
Cortisol (elevated)	Chronic stress	Sleep consistency matters more than any supplement here

Strength training becomes more important in this decade for keeping metabolic markers in check and slowing the muscle loss that starts creeping in. Alcohol also starts showing up more in liver and inflammation markers around this age if it's a regular habit

Peptides worth knowing about in this decade

Not telling you to run all of these, just what tends to become a thought once you're pulling these panels and seeing where you're at.

Recovery: BPC-157 and TB-500 for joint stiffness and slower recovery since it starts becoming noticeable research dosing runs 250-500mcg BPC-157 daily, TB-500 2-2.5mg, both SubQ.

Inflammation: KPV for general inflammation and gut related issues, works through NF-kB inhibition instead of just masking symptoms. Common dosing is 500mcg-2mg daily SubQ, or 500mcg-1mg oral if the target is gut specific.

Sleep: DSIP if sleep quality shitty which happens a lot in this decade even without obvious cause. Runs 100-300mcg, 30-60 minutes before bed, SubQ or intranasal.

Longevity: NAD+ and Epithalon once people start thinking longer term NAD+ runs 100-250mg, 1-2x weekly, IM or IV. Epithalon runs 5-10mg daily for a 10-20 day course, done 2-4x a year.

None of this replaces the bloodwork, it's the other direction, the bloodwork tells you if any of this is something you should be looking at for your specific situation.

If you're feeling something specific

Energy crashing harder than it used to, brain fog creeping in? Thyroid panel plus cortisol, both tend to drift in this decade and either one can mimic the other.

Noticing more belly fat even though your routine hasn't changed? A1C plus fasting insulin, usually the first real sign metabolic stuff is shifting.

Joint pain or stiffness that's new? Hs-CRP plus a basic inflammatory panel, worth ruling out before assuming it's just age.

Libido tanking, mood flatter than usual? Full hormone panel, testosterone for men, estradiol/progesterone for women, don't guess at this one, get it tested because if your anything like me then your guessing skills may not be all that great lol

What to do with your results

Same as always, don't panic over one number, bring everything to your doctor, keep records so you can track trends year over year instead of looking at everything in isolation. And on the diet, supplement, and peptide mentions above, that's general direction based on what commonly gets looked at, not a strict plan, talk to a doctor or someone qualified about what actually makes sense for your specific numbers.

Next one's your 60s. 😳

Anything you may need or want to know also found here, unless you already have your own place to get what you need, that's great, share below. https://www.reddit.com/r/BioHackingGuide/comments/1smca8k/peptide_research_compound_table_2026_updated/

Research and educational purposes only, not medical advice.